Almost certain that won't swap over. The input gear comprises the "sun" in the planetary gearset. Different planetary, different annulus, different sun all goes to produce the 4:1 ratio and are the core of what makes the TeraLow different than the standard 231.
to add to this, not only are the gears different sizes, the TeraLow uses something called a "compound planetary", where the planet gears are stepped with one half riding inside the ring gear and the other half , with a different number of teeth, riding on the sun gear.
I suspect this was the most practical/cost effective way they found to cram the 4:1 ratio into something that would bolt to the back half of a 231 case. The ratio is determined by the ring gear-to-sun gear tooth count so otherwise the input gear would have had to be made very small, or the ring gear very large.
The ratio is determined by S/(R+S), so for the 2.72 ratio in the 231, the ring gear has to be 1.72x the sun gear... for the 241OR it has to be 3x.
For the compound the math gets more complicated and I've spent enough time trying to find the right ratio equation without success.
If you look at the 241OR planetary you see the planets are huge in comparison, required to take up the space between the larger difference in diameter between ring vs sun. This probably also demonstrates why the 241 doesn't blow up when you rev past 2500 too much...large planet gears aren't spinning nearly as fast.
241OR:
231
TeraLow (note the smaller step in the planet gears is straight cut instead of helical, so even if the diameter matched up, the teeth don't work because the factory cases are all helical)
and inside the teralow case, the straight cut ring gear appears to be pressed into the case, whereas the standard 231 is retained by a snapring.
