Hey there, congrats! I was in the same boat (NSERC and FRQNT doctoral funding) and the rule is that, if you receive both, you must accept the federal funding instead of provincial. You cannot hold both. The extra detail is that if FRQNT offers you funding for a longer period than NSERC (say, 4 years when NSERC a offers 3) then you can receive NSERC for its full duration and then FRQNT for the extra period. They don’t stack, though. Hope that helps!