You might consider getting an SKF in 110, it has better bearings and seals, and a 10 year warrantee compared to the Phill's 1 year.

There are 3 things to consider: 1) chain stay clearance, 2) tire clearance, 3) chain line. Also, square taper BB don't always come out centered on the BB shell, so sometimes a small adjustment is needed. #1 is the most likely problem. Otherwise 2mm isn't very significant and is unlikely to cause a problem.

A good retailer will allow an exchange if you haven't ridden it and it is in a sellable condition.