Toolbag generates curvature data from the high poly mesh, so if you're using a simple low poly mesh this is the expected result. It looks like redshift is doing something extra to fake curvature from a low poly mesh, this is not something that Toolbag currently supports.
Hey Im not sure if it has improved in M4 (I didnt read any patchnotes about it) and I dont have 4 at hand right now but in Marmoset 3, baking low to low gives you basically no usable curvature map in most cases 3D coat does this pretty well and you can get some decent curvature maps from just the lowpoly Today I tried…