The engine in the Golf Mk5 Gti, Octavia Vrs and Leon FR is the BWA (the Golf also briefly used the AXX) which has a ko3 turbo. These are 185bhp to 197bhp.
The
Cupra (BWJ) has a different turbo (K04), injectors and internals to the BWA (amongst other bits). The S3, Leon
Cupra and
Cupra R, GTI Edition 30, 35 and MK6 R all use (broadly speaking) the same engine and K04 turbo, with some minor differences. These are 238bhp-261bhp.
The Mk6 GTI, facelift Octavia Vrs and facelift Leon FR use the newer E888 family of engines. These are 197bhp to 207bhp. I believe the new mk7 Golf GTI, Octavia Vrs and Leon
Cupra use this engine family too.
I hope this makes sense and I believe is accurate (ish)
Have a peek here for more details:
http://www.pistonheads.com/gassing/topic.asp?h=0&f=86&t=978634&nmt=2.0TFSi engines?