I never accept that a screw that's unknown to me is ‘standard’. I used to keep bit sizes for U.S. made Fender screws written down. These days I simply use the screw to judge the bit size by holding the bit behind the screw against the light to judge what bit I need. Are you going to forego inserting support splines? I believe that an undersized hole caused this, but there are other forces to deal with that could lead to failure of this repair unless the repairs are strengthened, imho. Remember if and when these cracks Re-open that they can be refused if you use wood glue and that then you will want to support the glue job with splines.