Why do you want to swap your 1600 engine camshafts for a 2.0 camshafts? Are your 1.6L cams worn, and you have a good set of 2L's lying around? Did you believe that 2L cams gave greater performance? (Alfar7's post above addresses this one).
Pretty much all Nord Alfa cams will physically interchange; e.g., cams from 1.3, 1.6, 1.8 and 2.0 engines all have the same basic dimensions. But the profile of the lobes varies. In general, later cams produce less performance as emission factors influenced their design.
Note that anytime you change cams, even 1.6 --> 1.6, you need to change the adjusting shims on each valve.