Assuming you're 225 front and 245 rear? They would fit (tires wouldn't be too wide) but the aspect ratios might be off.
Offset has more to do with the wheels clearing the calipers than the tires fitting. Maybe someone could chime in on this but 40mm should be able to clear the rear base brakes, worst case scenario you need spacers.
Simplest way to fix your "problem" is to get new tires for your new wheels. Maybe wait until the ones you are running are bald... but if you're not willing or don't have extra $ to shell out for tires that will fit the new wheels, is it really worth it or even the right time to do it?
Also you're posting in the wrong section...
Edit: should just post this in the thread you already started..
Help with wheel size!