According to the Technical Data Book December 1988, the 2.3-8V and 2.3-16V transmissions had different part numbers:

8V 717.411
16V 717.404

That being said, the real question is what are the differences?

That, I cannot tell you, sorry! Ratios could be found by searching through the appropriate manuals. Dimensions and mounting points are another matter.

Tom Elerding