I've seen three distinct variations of (walnut) Canadiancheekpieces Brian; an early type as fitted to a 39L rifle I owned many years ago that was not identical but very similar to most UK
types, & two chunkier varieties seen on later (such as 71L & 90L) rifles. Of these later types one pattern was 'taller & thinner' & one was 'chunkier' from side to side. But both types are a bit meatier than corresponding UK examples. I'll try & get some photo's when I get a minute.