All THREE now have Soundwave's Transformers T Logo on their bonnet but that's the only difference for Megatron.
Optimus is very similar to his western version, T logo aside, but the yellow on his legs is no longer bright yellow of Wave 1's Gearhead but is now the more sickly Wave 2 Soundwave Yellow.
Likewise Soundwave has swapped his wave 2 Sideswipe blue for Optimus' revision wave solid red *and* the wave 2 Frenzy purple on his upper legs, body and head for Megatron's revision wave silver.
As you'll be able to see there's a FOURTH bot on the images with the three Japanese Gobots. That's Botcon 95 Nightracer. She has just two plastic colours, the black and the yellow, and every indication is she was made with the leftover gang moulded bits from the Japanese set, which is why the robot parts are yellow rather than the blue that her creator Rashka intended tfwiki.net/wiki/Nightracer_(G2)
But let's pull on that thread for a moment: If Nightracer's robot parts were blue, instead of yellow, that would mean the whole sprue would be blue rather than yellow. And *THAT* would mean a Blue Soundwave Gobot and an Optimus with blue fronts to his legs, both MUCH closer to their original colour schemes. And if that were the case I suspect the Japanese Gobots would be even more highly sort after than they are!
Can still remember the day I got it and the impact it had, really blew me away. So much articulation and gimmicks (swing wings, missile launchers, landing gear) on a toy that small. *STILL* the best TF Jet toy, STILL in my all time top 5.
And, faction & identity questions aside) the colours just work really really well together.
There's an unreleased Orange and Green Tigatron in BW: I'd have loved to have seen an Orange & Red Tigatron as Hooligan