Physical difference in crank carriers from 2.5 to 2.7?

[Bebbetufs]

Great.
Thank you.
So, what I'm trying to figure out is if a 2.7 crank installed in a 2.5 carrier would cause the rod bolts or big ends to contact something. Most likely the areas where the arrows are pointing. I'm specifically wondering if the castings are the same but the machining in this area is different. It looks from the photo like some of the casting has been machined to ensure clearance. Perhaps this is left untouched in the 2.5 carrier. If this is the case, all I need to do is to machine my 2.5 carrier in order to upgrade to a 2.7 crank.