diff --git a/packaging/markers.py b/packaging/markers.py
index 4d657e9e..8f1bfa22 100644
--- a/packaging/markers.py
+++ b/packaging/markers.py
@@ -326,7 +326,7 @@ def __hash__(self) -> int:
         return hash((self.__class__.__name__, str(self)))
 
     def __eq__(self, other: Any) -> bool:
-        if self.__class__ != other.__class__:
+        if not isinstance(other, Marker):
             return NotImplemented
 
         return _flatten_marker(self._markers) == _flatten_marker(other._markers)
diff --git a/packaging/requirements.py b/packaging/requirements.py
index e5a6e77e..628d2997 100644
--- a/packaging/requirements.py
+++ b/packaging/requirements.py
@@ -149,7 +149,7 @@ def __hash__(self) -> int:
         return hash((self.__class__.__name__, str(self)))
 
     def __eq__(self, other: Any) -> bool:
-        if self.__class__ != other.__class__:
+        if not isinstance(other, Requirement):
             return NotImplemented
 
         return bool(