Which is better(Cams B16A vs GSR B18 not Type R)?

My buddy just bought an extra GSR motor w/ Type R Cams which he plans on putting in his old motor. His old motor has stock GSR cams which he's willing to just give/trade me because he's not going to use them. He says it would give me 4hp and I wouldn't need double valve springs. Is this true and would there be any negative changes to my power band now?