Why a Canadian fleet unit costs more than its ships

Would a Canadian fleet unit with Queen Elizabeth-class ships cost the same as an Australian-style Royal Navy unit?

No. The ships might have similar purchase costs, but Canada would need much more supporting infrastructure to operate and sustain them.

Canada would need to build much of its supporting infrastructure from scratch, whereas Australia had a stronger starting position. Similar procurement costs therefore conceal major differences in docks, maintenance capacity, training, and recurring support. A preserved Tiger could become part of a fast imperial squadron, with consequences for eastern basing and carrier dispositions. Canadian Queen Elizabeth-class ships operating in pairs across the North Atlantic would leave even a surviving German raider unable to afford damage on the route home past Britain. A Tiger-centered force could instead shift fast ships and supporting carriers toward the Indian Ocean, making basing policy part of the decision rather than a detail after the ships are bought.