Can I swap factory tilt/trim from Mercury version 85hp to US Marine version 85?

[The Force power]

in 89 they changed water pump styles.
Not positive but they might swap(not parts,whole pumps)
They introduced the Hell Drive and needed a stub shaft to connect to the L drive.
I believe in 90 when they started on the 90/120/150 they standardized the gear ratio. They all had the same ratio at one point. Markings on the case should tell what's in there.

 

[jerryjerry05]

After seeing the pics: Both motors are US. Marine
The drive with the short shaft is from the 90's
not positive what year but doing some research can figure it out???

 

[62Scout]

I know lots of people dislike people asking questions, then never updating results...well, took another year, but I finally got back to this project.
Turned out swapping those T&T units was a LOT simpler than I expected. Didn't even have to touch the bit pivot bolt, just pulled the all parts in between the two large "horseshoe" shaped mounting brackets. All the holes were already present on the motor getting the T&T unit, and I only had to run a thread chaser to break out the paint on the threaded holes.

Pretty sure I could have done it with the motor still hung on the transom if I really had to, but I have a large crane mounted to my service truck, and why make things hard when you don't have to?

All in all, took about 30 minutes to swap it all over, and works great...in the driveway at least. Still working through some carb issues (pretty sure it was just old gas), but fingers crossed this thing will be in the water this weekend for the first time in a LONG time.