diff --git a/test/intl402/DateTimeFormat/prototype/formatRange/to-datetime-formattable-with-different-arg-kinds.js b/test/intl402/DateTimeFormat/prototype/formatRange/to-datetime-formattable-with-different-arg-kinds.js
new file mode 100644
index 0000000000..575d28b93a
--- /dev/null
+++ b/test/intl402/DateTimeFormat/prototype/formatRange/to-datetime-formattable-with-different-arg-kinds.js
@@ -0,0 +1,77 @@
+// Copyright (C) 2024 André Bargull. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-intl.datetimeformat.prototype.formatRange
+description: >
+  ToDateTimeFormattable is called on both arguments before checking if the
+  arguments have a different kind.
+info: |
+  Intl.DateTimeFormat.prototype.formatRange ( startDate, endDate )
+
+  ...
+  4. Let x be ? ToNumberToDateTimeFormattable(startDate).
+  5. Let y be ? ToNumberToDateTimeFormattable(endDate).
+  6. Return ? FormatDateTimeRange(dtf, x, y).
+
+  ToDateTimeFormattable ( value )
+
+  1. If IsTemporalObject(value) is true, return value.
+  2. Return ? ToNumber(value).
+
+  FormatDateTimeRange ( dateTimeFormat, x, y )
+
+  1. Let parts be ? PartitionDateTimeRangePattern(dateTimeFormat, x, y).
+  ...
+
+  PartitionDateTimeRangePattern ( dateTimeFormat, x, y )
+
+  ...
+  5. If IsTemporalObject(x) is true or IsTemporalObject(y) is true, then
+    a. If SameTemporalType(x, y) is false, throw a TypeError exception.
+  ...
+features: [Temporal]
+---*/
+
+var callCount = 0;
+
+var invalidDateValue = {
+  valueOf() {
+    callCount += 1;
+
+    // TimeClip(NaN) throws a RangeError in HandleDateTimeOthers, so if we see
+    // a RangeError below, it means the implementation incorrectly calls
+    // HandleDateTimeOthers before checking for different argument kinds.
+    return NaN;
+  }
+};
+
+var objects = [
+  new Temporal.PlainDate(1970, 1, 1),
+  new Temporal.PlainDateTime(1970, 1, 1),
+  new Temporal.PlainTime(),
+  new Temporal.PlainYearMonth(1970, 1),
+  new Temporal.PlainMonthDay(1, 1),
+  new Temporal.ZonedDateTime(0n, "UTC"),
+  new Temporal.Instant(0n),
+];
+
+var dtf = new Intl.DateTimeFormat();
+
+for (var i = 0; i < objects.length; ++i) {
+  var object = objects[i];
+
+  assert.sameValue(callCount, i * 2);
+
+  assert.throws(TypeError, function() {
+    dtf.formatRange(invalidDateValue, object);
+  });
+
+  assert.sameValue(callCount, i * 2 + 1);
+
+  assert.throws(TypeError, function() {
+    dtf.formatRange(object, invalidDateValue);
+  });
+
+  assert.sameValue(callCount, i * 2 + 2);
+}
diff --git a/test/intl402/DateTimeFormat/prototype/formatRangeToParts/to-datetime-formattable-with-different-arg-kinds.js b/test/intl402/DateTimeFormat/prototype/formatRangeToParts/to-datetime-formattable-with-different-arg-kinds.js
new file mode 100644
index 0000000000..3409016ba5
--- /dev/null
+++ b/test/intl402/DateTimeFormat/prototype/formatRangeToParts/to-datetime-formattable-with-different-arg-kinds.js
@@ -0,0 +1,77 @@
+// Copyright (C) 2024 André Bargull. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-Intl.DateTimeFormat.prototype.formatRangeToParts
+description: >
+  ToDateTimeFormattable is called on both arguments before checking if the
+  arguments have a different kind.
+info: |
+  Intl.DateTimeFormat.prototype.formatRangeToParts ( startDate, endDate )
+
+  ...
+  4. Let x be ? ToNumberToDateTimeFormattable(startDate).
+  5. Let y be ? ToNumberToDateTimeFormattable(endDate).
+  6. Return ? FormatDateTimeRangeToParts(dtf, x, y).
+
+  ToDateTimeFormattable ( value )
+
+  1. If IsTemporalObject(value) is true, return value.
+  2. Return ? ToNumber(value).
+
+  FormatDateTimeRangeToParts ( dateTimeFormat, x, y )
+
+  1. Let parts be ? PartitionDateTimeRangePattern(dateTimeFormat, x, y).
+  ...
+
+  PartitionDateTimeRangePattern ( dateTimeFormat, x, y )
+
+  ...
+  5. If IsTemporalObject(x) is true or IsTemporalObject(y) is true, then
+    a. If SameTemporalType(x, y) is false, throw a TypeError exception.
+  ...
+features: [Temporal]
+---*/
+
+var callCount = 0;
+
+var invalidDateValue = {
+  valueOf() {
+    callCount += 1;
+
+    // TimeClip(NaN) throws a RangeError in HandleDateTimeOthers, so if we see
+    // a RangeError below, it means the implementation incorrectly calls
+    // HandleDateTimeOthers before checking for different argument kinds.
+    return NaN;
+  }
+};
+
+var objects = [
+  new Temporal.PlainDate(1970, 1, 1),
+  new Temporal.PlainDateTime(1970, 1, 1),
+  new Temporal.PlainTime(),
+  new Temporal.PlainYearMonth(1970, 1),
+  new Temporal.PlainMonthDay(1, 1),
+  new Temporal.ZonedDateTime(0n, "UTC"),
+  new Temporal.Instant(0n),
+];
+
+var dtf = new Intl.DateTimeFormat();
+
+for (var i = 0; i < objects.length; ++i) {
+  var object = objects[i];
+
+  assert.sameValue(callCount, i * 2);
+
+  assert.throws(TypeError, function() {
+    dtf.formatRangeToParts(invalidDateValue, object);
+  });
+
+  assert.sameValue(callCount, i * 2 + 1);
+
+  assert.throws(TypeError, function() {
+    dtf.formatRangeToParts(object, invalidDateValue);
+  });
+
+  assert.sameValue(callCount, i * 2 + 2);
+}