Yes, there may be risks involved, and/ or disadvantages, i don't know about the exact differences between the 2.0 and 1.6 pinto head, but the bore on the 1.6 is probably smaller, the ports and valves may be smaller to match, so the 1.6 may be restrictive compared to the 2.0 head, the 1.6 combustion chamber may be the wrong size and shape for the 2.0 bores, and the squish "wrong"

Once you raise the compression ratio you may need to richen the mixture, run colder plugs, adjust the ignition timing or use higher octane fuel to avod detonation

Normally in English language/ UK (and also probably the USA) we use the term "compression ratio" - the normal way to increase the compression ratio on a 2.0L pinto would bo to use thinner gaskets or skim the original (2.0L) head