They are ALL different. Even between MGIV RC and FB, they are different. Even if emlusion reacts the same, paper texture will make the contrast LOOK different which requires different contrast grade, which will affect your exposure time. There's quite a bit of difference between neutral and warm tone papers. So if you use multiple papers, it will get quite confusing FAST.

All you can do is cut up a sheet into small parts and test few times. Once you get a hang of it, you can extrapolate from different paper type fairly well. Then few more sheets to fine tune. It's wasteful. There's no doubt about that.