Here are more pics
The 1st angel always appears fatter, but it has a "notch" on its head, so I'm baffled if it's female. The 1st angel also grew faster, although the 2nd angel eventually caught up.
The main reason I'm wanting to know the gender, is because sometimes it seems as though they are fighting, although I've never seen signs of damage. The tank, they are currently in, also houses ropefish, which would definitely eat eggs/fry. I don't want to spend the money on a second large set up to breed them if they're the same sex.