Yes indeed, every manufacturer seems to have different idea of what a size 14 hook is, I have some that are to my mind a size 12 and some that appear to be between between 12 and 14. Had some hooks years ago that were labelled 14 but were huge. and the 16's were definitely a size 12.
Yes and I read many years ago that hooks were sized by shank length and gape was a fraction of that length, I read on this site that size is by gape and shank is a multiple of that.
I don't recall how I arrived at #16 for these back in the '70s, but it looks like that's about right, and I know it'll catch in that size.