I wouldn't argue that a European diaspora country were that culturally unrelated to a European country. Completely incomparable is a stretch.
But the culture isn't what we are comparing. What we are looking for is the comorbidities in the age range of 0-65 in both countries. They have similar climate ranges, similar eating habits, similar healthcare systems, similar genetics, etc. So we should expect that under similar covid contingencies we would get similar mortality in that age group. We wouldn't of course get exact equal values, at the very least random variance would introduce some discrepancy, but we can get a very good idea of what would've happened to that age range in Canada had there been no lockdown measures.
But the culture isn't what we are comparing. What we are looking for is the comorbidities in the age range of 0-65 in both countries. They have similar climate ranges, similar eating habits, similar healthcare systems, similar genetics, etc. So we should expect that under similar covid contingencies we would get similar mortality in that age group. We wouldn't of course get exact equal values, at the very least random variance would introduce some discrepancy, but we can get a very good idea of what would've happened to that age range in Canada had there been no lockdown measures.