Well logically, assuming the 100mm measurement is consistent (there's the question of whether 100mm in cockpit stem length is the same as 100mm in standalone stem length), assuming the stem angle is consistent (not all cockpits have the same stem angle, and your Scott stem has a stem angle), assuming both bars are about the same geometry (not all bars / cockpits have the same reach, drops...), then if you pick a 100mm cockpit, your position should mirror the new frame (stack & reach) geometry, so you should be lower (15mm) and closer (11mm) - btw 110mm is 11cm, i assume you mean 11 & 15, not 110 & 150. The stack is easy to adjust with spacers. The top tube of the 301 being shorter, in principle, you should get a 110mm cockpit.