Output shaft? As in the bit that sticks out the back and mates with the tailshaft?
Many years ago I stripped an AE86 and a T18 T50 (I think) and there were some differences with the main shaft that meant they couldn't be swapped. From memory ID of some of gears was different, there may have been other details that differed, but I didn't look further. So I'd suggest, that no you won't be able to swap them over.
Easiest solution would be to find a 20 spline tailshaft front section, or just the yoke and have it fitted to your tailshaft.
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