Owners of this exact guitar have asked about this swap without a clear answer on whether the holes need to be enlarged first. Worth measuring your tuner posts before ordering.
Why we say this
This exact guitar (2020 Epiphone Flying V, stock Epiphone Vintage Deluxe tuners) has an active owner discussion asking whether swapping to this compact Grover line requires reaming, with no clear consensus reached. Epiphone Vintage Deluxe-branded tuners on other models in this catalog use press-in bushings smaller than the modern 10mm standard, but that has not been independently measured on this specific Flying V.