I've barely been able to find any different data. Normally the only thing that seems to change, is the powder types in the manuals I've seen.
This is on the money. There are no differences as far as pressure spec for .38 Special and .357 Magnum in revolver or rifle data. The only exception is that I have never seen .38 Special load data for rifle and in the case of .357 Magnum loads for rifle you may see data for a few slower burning powders that aren't practical for revolver loading unless you're not concerned about the velocity loss you'd experience in using powders like IMR or H4227 and others.