Important question for purchasing decision:Light rims for CTR

Hello people it looks like this,I stand before the decision either I buy on Monday a set of winter tyres with Ronal rims, stays as a normal winter set, and the original rims then remain the summer set. However, I always like the RH Porsche Cup rims 8×17 extremely well, therefore I am still thinking about whether I buy the and the winter tires and then make the original rims (which I also don’t find bad) to winter rims. Now the question is still in the room around which I with my previous car little to not cared, how light the rims are, and above all what that makes in the driving behavior!! I don’t know how heavy the RH rims are, but what does that really matter for our CTR if these rims should be a bit heavier than the originals ???!??!!