Well, no, not really. Winchester has about 2.7 grains more water capacity than Lake City. Hence the 43 gr vs. 42 gr match starting loads. Some brass, like IMI, is even heavier and smaller inside than Lake City, and that accounts for the 41 grain starting load in the regular data. No load data can be expected to be safe in all cases at maximum. That's why starting loads exist. You work up from there to where your case in your gun says "stop". Why the standard data doesn't make it to 45 grains, I don't know.