Razz311

I am looking for a replacement box for my 2007 1.5R Impreza Wagon, Gearbox code TY754XY7AA but i have no luck finding a exact replacement. I have however found a TY754XY2AC which looks like it will fit but the only thing i am unsure about is the gear ratios and whether the current diff will work or if i will need to change the diff as well. Does anyone know the ratios or will i have to get inside my diff and have a look? I have had a look online but have found no results so far.