No, the 5243 was initially sold as a 45 hp, while the 5243 T (turbo) was sold as a 55 hp. The Dutch importer sells them as 50 and 60 hp. I dont know if those are factory settings.
If you want to buy a new one, i'd say you better wait till next year, (that is soon) all of these engines will be replaced with the UR3 Forterra series of engines. Not just the new range will get them, but also the Super series will get Forterra 3 and 4 pots. So maybe there will be a 65 hp three pot.