Just the 2 as far as ratings go. We encompass all 951 flights with the 953.. the 953C having dedicated cargo routes. Of course, your rating will enable you to fly the 952 routes (ACA) in Canada too so there's a lot to go at with the Vanguard.. not just bread and butter runs to Europe
There's a separate 952 panel to complete the illusion you're flying something different. It's similar of course but different enough to look like you're sitting in something else 
EDIT: All the Vanguards are listed as VC9 and this covers the 951/952/953/953C. You can in theory (in practice too) fly say Concorde over to the U.S.. leave it in NY for a spell and grab a ticket to CYUL/CYYZ (where our 952's are based) then spend a bit of time flying the Canadian Vanguard routes. When you've had enough.. leave the Vanguard at one of it's 2 bases then grab a ticket back to NY to fly Concorde back for it's return. It breaks the routine and you get to see places you'd otherwise not have seen. Sadly, there were never any ACA Vanguards based at JFK so it's always going to be a 'ticket job' to pick one up but the option is always there and it's cheaper than getting a ticket from EGLL to Canada!
A full set of paints is available for each aircraft on the TCA/ACA run
ATB
DaveB
