Gearboxes Sirion2

Hello, i have a 2007 Sirion2 sport with K3VE engine. The code on the gearbox is 956. I can get a low mileage gearbox from a normal 2006 Sirion2 with code 952. The engine was also a 1.3 16v. Are the ratios different on these boxes, and how? Cause they look the same.
I used to drive Opel and they had these sport editions with the same engines as normal ones but different ratio gearboxes, that was what i was told.
Regards