The biggest mistake that can be made when comparing two frames using reach and stack numbers is forgetting to make a correction to the reach when the stack heights are different.

If two frames have a large 20mm difference in stack, there will be an additional 6mm difference in reach between the two frames. I assume that the shorter frame would be set up with 20mm of spacer, which would reduce the reach by about 6mm, compared to the taller frame.