The Mk1 1.2 16v cam is better than the Mk2. Straight fit in so far as FIRE 16v cams are ever a straight fit.
Remap, but it makes sense to at least change the manifold and induction before remapping. C & B do a few cams for the FIRE 16v: they're all limited to some extent by FIAT's decision to go hydr5aulic.