90-93 ls trannys all have the same gear ratio with a .742:1 5th gear ratio. 94+ls trannys have the same gear ratio as the 90-93 with a different .714:1 5th gear.(A little longer geared 5th, everything else is the same)
Yes 90-93 are all cable, 94+ are all hydro.
The difference is around 3-4 mph at 70mph with those two types of trannys.
Also for comparison purposes at 4000 rpms with a s80 ls tranny in 5th you'll be at around 91mph with 15s, with the same tire and rpm using an old gsr ys1 tranny you would be at around 72mph. Gearing plays a huge difference but shorter is not always better.