There's really no answer but to test-fit and see. Potential problem areas (i.e., possibly requiring minor trimming or -- rarely -- more major surgey) are likely to be:
a) width of assembled fuselage/cockpit area of the model itself - is it too narrow to allow resin insert to fit...or do corners or edges of the resin need trimming;
b) cockpit opening cutout, 'edges,' or spacing; (again, does something need trimming, removal, or reshaping);
c) molded obstructions (locating pins or otherwise) on cockpit sides, getting in the way of the resin tub;
d) is there anything underneath (such as molded-in gear bay, etc.) that will get in the way of the resin tub;
e) how will you mount the resin cockpit tub itself? You may need to add tabs, shims or similar to get a secure attachment.
f) --hopefully last-- check seat height against the fitted canopy before making final tub attachment. You can 'fudge' the cockpit depth a bit if necessary: it's harder to 'shorten' seats.
Most of these things take far longer to describe than to check out and fix. As I recall, the high-end old Fujimi kits were some of the best-engineered cockpits around, while the low-end were no worse than cheap Revell or Airfix kits...so, hopefully, problems should be minimal or non-existent. I swap aftermarket products and 'non-intended' kits all the time, and rarely have any serious problems, with a little pre-fitting. 
Good luck!