As long as the bridge is the correct distance from the nut you will be fine.
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i'm not 100% sure, but i think the disance between the nut and 12th fret
should be the same as the distance between the 12th fret and the bridge.
measure your 3/4 guitar as mentioned above.
if you then fit a full size neck, these measurements will be wrong.
so i dont think it will work.
if you cant get an answer, post on here and i will ask one of my friends who makes guitars
. You, sir, are correct!