FKS have about a 10mm adjustability range...with that in mind it also depends where on they currently lie on the adjustability range. I would say probably not and you should definitely take them to a shop to have them do it. Manly the reason for that is even if they are able to adjust to that size your forward pressure will be whack.
Depends on how the jig was set when mounting originally. If the jig was set 5mm smaller than the original boot (like you're supposed to) then they won't fit. If the jig was set to the original boot, they'll fit.