The 246 came out in 97 iirc. They all interchange to my knowledge, the difference lies in the encoder motor. If you swap the correct encoder in, any of them should work.
Well all done it appears to have been a reman tcase in a vehicle that had 130k on it so it could be pretty low mile. Sure was nice doing it on a lift the hardest part was just wrestling it out and in. No way to use a tranny jack