diff --git a/pandas/core/dtypes/dtypes.py b/pandas/core/dtypes/dtypes.py
index f76163cbbd0a1..cfe19125ed717 100644
--- a/pandas/core/dtypes/dtypes.py
+++ b/pandas/core/dtypes/dtypes.py
@@ -1697,7 +1697,7 @@ def __eq__(self, other: object) -> bool:
 
         if isinstance(other, type(self)):
             subtype = self.subtype == other.subtype
-            if self._is_na_fill_value:
+            if self._is_na_fill_value or other._is_na_fill_value:
                 # this case is complicated by two things:
                 # SparseDtype(float, float(nan)) == SparseDtype(float, np.nan)
                 # SparseDtype(float, np.nan)     != SparseDtype(float, pd.NaT)