There are many differences between the North American built and Canadair built Sabres. In my opinion, the Hasegawa Sabre is the best of the lot even though the Revell / Monogram Sabre has a few more accuracies for a Canadian Sabre. The R/M Sabre has the correct rounded nose gear oleo leg while the Hasaegawa and Academy nose gear legs are incorrectly shaped (more angular than round).
The R/M Sabre also has the correct engine vents on each side of the fuselage. One drawback, I found, was the flimsiness of the main gear legs. As mentioned, the intake and exhaust openings are poor on the R/M kit but can be remedied with FOD covers from the Hasegawa kit. The R/M kits is only an F-86F-30 or Canadair Sabre 5 with the wing fence.
Hasegawa makes an F-86F-30 (Sabre 5) and an F-86F-40 with resin or plastic wingtips and a bent pitot tube to build a Sabre 6. The Sabre 6 wing is slatted like the F-40 wing but it doesn’t have the 12 inch wingtip extensions of the F-40. Wingtip surgery is needed to correct the wings if you want to build an acurate Sabre 6 from Haseagawa.
Further, on the Hasegawa kit, you must sand down the raised area around the vent on the top of the fuselage at the base of the vertical stabilizer and remove the raised rectangular vent on the right rear fuselage near the speed brake door. Canadair Sabres didn’t have these vents. Sabre 5’s and 6’s didn’t have a fuel filler port on the port side of the fuselage. There were two ports on the the right side.
Leading Edge Models makes fantastic decals for Canadair Sabre 5’s and 6’s. This set has decals to represent the fuselage engine vents I referred to in my bit about the R/M Sabre. If you can find a set of their fuselage stencils, get them. They’re fantastic too. I would attach reference photos but I’m on a tablet and the photos are on my desktop at home.
Good luck with your RCAF Sabre project.