I had a 2018 RT and currently ride a 2021 RT. The big difference between the current and previous generation RT bars is modularity. With the previous gen RT, you had a grand total of (2) different bars. Other than the stock bars, you could only get the expensive TriAxis bars. Unless you were willing and capable of basically removing the entire front end of your RT, you then had to pay $500-$700 labor to swap bars. If you later decided what you "really" wanted were the stock bars, you'd have to pony up another $500-$700 to swap them back.
The 2020+ RTs use the F3 bars. ANY of the F3 bars. And, it takes all of about 10 minutes to swap them out. Total of (8) bolts. A kindergartener could do it. Don't like option A, try option B. Don't like those, try option C. Don't like any of the (5) options available (6 if you count the drag bars which will NOT fit an RT without tall risers), you can buy Helibars. Again, about 10 minutes to swap out. Different heights, different grip angles, too. You can pull them closer to you or push them farther away to fine tune the bars. You don't have to disassemble anything to swap the bars, either.
With all that said, I think both the current and previous gen bars put the grips in a similar position in relation to the rider. I liked the current gen bars a little better but at full lock, both would dig into my thighs. (FWIW, I ended up with Helibars. Not cheap but they're multi adjustable works really well.)
HAGO!