The RRs are a fine tire and an improvement over the RA1. I suspect you'll be faster.
If you can use the taller gearing they will likely serve you just fine. Handling will be challenging to compare to the RA1 because the RR is quite different. Handling between the 45 and 50 aspects probably isn't as significant as the effect on acceleration.
It all comes down to application. When I was competing in TTB many years ago, I found 255s to be noticeably slower than 235 or 245s for my application. Car was ~230whp/3260lb, and gearing was a bit too tall in 3rd-5th as it was. The 255 were almost an inch taller and 1-2lbs heavier per corner so it didn't help the situation. Despite being significantly wider they were a few tenths/lap down and noticeably slower acceleration. I preferred the shorter tires in MY application.
Are these for fun or comp? If the former I wouldn't think twice about buying.