Test series replace different numpy int

pandas/tests/series/methods/test_replace.py

@@ -651,3 +651,14 @@ def test_replace_regex_dtype_series(self, regex):
         expected = pd.Series([1])
         result = series.replace(to_replace="0", value=1, regex=regex)
         tm.assert_series_equal(result, expected)
+
+    def test_replace_different_int_types(self):
+        # GH#45311
+        labs = pd.Series([1, 1, 1, 0, 0, 2, 2, 2], dtype=any_int_numpy_dtype)
+
+        maps = pd.Series([np.int8(0), np.int8(2), np.int8(1)])
+        map_dict = {old: new for (old, new) in zip(maps.values, maps.index)}
+
+        result = labs.replace(map_dict)
+        expected = labs.replace({0: 0, 2: 1, 1: 2})
+        tm.assert_series_equal(result, expected)