Will using the different grip of a SA revolver really hurt me when it comes to firing a DA revolver.
Maybe - maybe not. Probably not since the S/A is a totally different gun.
BTW - what do you mean by "grouping"?
Also - when it comes to a swing out cylinder and reloading, the D/A can use speed loaders.
W/a S/A, you have to open a loading gate and eject the empty shells out one by one.
That slow reloading process is one reason I don't care for a S/A, either as a beginner gun or a fun range gun.
Kicking out empties get old quick and does zip to enhance shooting skills.
I pay range fees by the hour to shoot, not to waste time reloading.
It sort of takes a lot of the fun out of it....