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The diameters of the outside pulley and inside shaft port will have to be the same (exact). Cam and valves are set for time with the crank. Changing diameters of either pulley will change how the system is timed.
Use a micrometer to measure both the shaft port and the outside diameter of your pulley. Then measure the MR20 pulley. If they are the same, it should work.
The 1.8 and 2.0 ltr engines may have the volume difference in the heads which is why the Versa and Sentra heads are interchangeable. I HAVE NOT DONE THIS MOD AND CANNOT ENSURE IT WILL WORK. I have but 360 heads directly on a 318 motor (V8s) and it was a direct swap.
Finally, adding a head with more ‘dome’ space might give you less power at low end. These are small engines that need higher revs for the power band. While measuring the pulleys, also measure the 2.0ltr head dome compared to the 1.8. Is it wider┐, or deeper┐, Wider will allow you to use the same spark plug but fuel will have more areas to hide and may not combust completely. Deeper will allow you to use a longer plug that will help with combustion.
Please let me know how it goes.