Yeah, that's why in my original post I said acan/homophyllia bowerbanki - some people don't keep up with the reclassification and so i mentioned both in case ... Kind of like "acan lords" vs Micromussa.First of all, there is no such thing as a bowerbanki acan or a bowerbanki Favia. Bowerbanki is a species of coral from the genus Homophyllia.
Second of all, you shouldn’t always trust seller/import IDs as they get things wrong all the time. Third of all, bowerbankis have larger (max 20mm) and more irregular corallites while acans have smaller (max 10mm) and more circular corallites, like your coral.
Best and most conclusive way for coral is looking at the skeleton