Interchange of parts is generally a NO, but the experts on this era will let you know. For one thing Canadian Cars were never Wide Track being built on the Chevrolet chassis and that affects panel fastening and length etc...
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Ray White, Toronto ON
Formerly - The one and only 1973 LeMans 454 "Astro-Jet"
I am fairly certain the quarter panels are a little differert in overall length,BUT on my 62 Laurentian 2 dr ht i installed fender skirts off a 61 Catalina, and ever doors off a 62Grand Prix. I am not sure about the rest of the sheet metal as the CAN/UScars have different frames and rad supports under them.