The Abarth calipers, discs and caliper mounting brackets are bigger than the 1.6 ones, so you would have to change all of those components.
I think the Abarth caliper mounting bolt holes are spaced wider, so you may also have to change the hubs. The bearings in the Abarth hubs may also be bigger, so you may also have to change driveshafts.
Depending on what size wheels you have on your 1.6, you may also have to change them to accommodate the bigger discs and calipers.
Kali tichi.
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