Why *New England has Anticosti Island but not Cape Breton or PEI, I'm sure I don't know.
Britain having only the Avalon peninsula of Newfoundland seems odd, but possible, I suppose. Having Cape Breton and PEI but not any other part of the Maritimes is also exceedlingly odd. They lose Halifax, their major port and retreat to Louisbourg? Don't think that'd work, but I suppose it's arguable.
The borders of Rupertsland make no sense at all. British influence/control would surely either extend along the fur trade rivers (Churchill and Saskatchewan) through OTL provinces of Saskatchewan and Alberta or they'd pobably be kicked out of northern Manitoba, too. Stopping at the OTL Manitoba border is ... ASB, IMO.
Moreover, I can't see how France/Quebec owns that chunk of northern Ontario. The Brits and the Blues (Pennsylvanians? Dutch? Iroquois?) would border on each other there - there are no rivers running east-west, that area would be serviced out of Hudson Bay or the Great Lakes (most realistically at the watershed). Also, the Brits out to have control of the eastern shore of Hudson Bay. That land was only given to Quebec much later OTL, and it is very difficult to supply/project power there from the south.