Canada has nearly ten million square kilometers of land. ~78,000 km2 (for Scotland) is barely a drop in the bucket, and ~600 km2 (for T&C) is a rounding error on a rounding error.
OTOH, adding ~5,000,000 people (Scotland) to a population of ~35,000,000 is a big jump. ~31,000 people (T&C), not so much. Either way, Canadaβs population density, once either/both countriesβ land and people are accounted for, is going nowhere but up.
Even if the Scots wanted to leave Scotland behind entirely (not that they ever would), we already have an entire province (only 30% smaller than Scotland) set aside for them.