If the lobe family is the same then it shouldn't be much of a change. If the lobe family is different then you might see an improvement or perhaps a problem. The additional intake lift might cause you an issue so you'll need to double check that for sure. I've done a lot of cam testing and what I've learned is that it is almost impossible to guess what a slightly different cam will do in an engine. The interaction between the intake runners, head porting, exhaust system and the cam lobe is too complex to fully understand.
Yep sometimes you never know. A good engine simulation with good info imputed is the best bet to try and understand what will happen. And I don't just look at max HP and Torque, I look at average HP and Torque, predicted cylinder pressure, volumetric efficiency, and where it happens at.
