fix share buffer to (#38407)

Author: Baibaifan

paddle/fluid/pybind/imperative.cc

@@ -1983,6 +1983,7 @@ void BindImperative(py::module *m_ptr) {
                  platform::errors::InvalidArgument(
                      "Tensor %s has not been initialized!", self->Name()));
              dst_->ShareBufferWith(*src);
+             dst_->ShareDataTypeWith(*src);
            })
       .def("_is_shared_buffer_with",
            [](const std::shared_ptr<imperative::VarBase> &self,