I'm not entirely sure what the differences are in sensor, but on the transmission side I'm pretty sure your 91 would have a 4L60, not a 4L60E, so you're going to need that part of the harness at least. If you're pulling them anyways, I'd probably swap them all over.
You may run into tach issues, as I believe they use a different tach sensor or something like that between 91 and 95. Your 95 is the new style interior too, which means the cluster is different so I'm not sure what all is involved there, I'm guessing different plugs/harness.