Just a guess, but yes,
lower output engines in an FR will have 256mm front discs and not have separate calliper carriers, higher output engines will have or really should have 288mm front discs, same as any other
Ibiza lucky enough to get these brakes.
When I was looking for a brand new
Ibiza for my wife back in 2015, it seemed that not all higher engine output FRs had been lucky enough to end up with 288mm from discs - so that made me stick with getting her a Polo as they always fitted the correct brakes to the higher engine output versions of 1.2TSI engined cars.