Patoruzu
Airman
Yup, definitely looks like it. The R.A.F. version is the Embraer-designed Tucano, built under licence by Shorts of Belfast. I believe the others, Pilatus et al, are also licenced from Embraer. What appears to be two fins I think is light reflecting off the fuselage, plus the ventral fin. A very nice aircraft, BTW.
The Texan II is a USA tailored Pilatus built by Raytheon winner of the Jpats.
The aussie one is also a pilatus.
But they have nothing in common with the British Tucanoes or the Brasilian ones. The Tucano was also a contender of the Jpats.