Yes, ther are all sorts of grip frames that can be intwerchanged on Blackhawks and Super Blackhawks. Different shapes, sizes and materials. You can install a "birds head" style, Bisley style or others. Also bl;ued, brass or stainless.
If you want the best information available on this, go to
RugerForum.com
This is the place for all things Ruger. Very nice people and extremely knowledgeable. Some of the threads are extremely detailed,
Good luck.