Moraine or bendix master cylinder?

Does anyone know the difference between a moraine or bendix master cylinder for a 1968 Impala drum/drum brake system?

Does anyone know the difference between a moraine or bendix master cylinder for a 1968 Impala drum/drum brake system?

Moraine is OEM while Bendix is aftermarket.

Thanks Silicon212. Just wondering because I need one and my 68 GM parts book lists both but doesn't note the difference. I have a feeling that there may have been a switch part way through the year.