sme 312 bearing upgrade


I am wondering if the SME 312 bearings can be upgraded to bearings from the sme series IV or series V. Anybody know this one?
c123666
Enquiring minds want to know. Ask these guys. http://www.sme.ltd.uk/html/conpage.html
They will probably say the 312 is too heavy to use the same bearings as the V.
SME responded but not directly to my question. They said the 312 bearings are of the same class as the V. I replied with the basic question of: Were one to have damaged bearings can the 312 use series V bearings as a direct part replacement? The bases look the same so it should work I would think but I am only an accountant....
So, is SME saying the bearings are the same in the V and 312? That's what it appears.