Oh, I wouldn't count on that. The top cover went through at least one revision.
It also may matter whether you're talking about the stick itself or the stub.
I see this "it's the same trans" claim all the time. No, not every M5OD is identical. There are several variations. 2WD vs. 4WD. Cologne vs. Lima vs. Vulcan. HD vs. non-HD. and so on. And this situation is thoroughly typical. There are very few transmissions that don't change throughout a run (unless that run is very short). If you want an example, try installing my SM465 into a Suburban or K-series. They came with them for many years, but you'll be in for a nasty surprise.