Except that the Shorts version has more than a third more power and a lot more performance. The French flew the RAF Tucs and told their Government that's what they wanted to replace the Fouga Magister. The French Government looked a the cost of the Shorts compared with the Embraer and chose the latter. So the Armee De La Air ended up with an intermeditate trainer which would do 180 knots at low level which followed on from their basic trainer, the Epsilon which did, er.... 180 knots at low level!
I've flown a French Embraer Tuc and it's gutless compared with the Shorts. they're different animals.