If the angels are fanning & protecting the eggs, they are angel eggs. Angels will eat cory eggs, if you see angels eating instead of protecting they are cory eggs.
Some of it depends on how close to the surface the eggs end. Angels will spawn up until their nose touches the surface, they can't go any higher. If the distance from the surface to the top of the spawn matches up with the distance between the angel's mouth & ovipositor, you have angel eggs. It does appear to have the pattern of a first spawn, not in neat rows, angel's tend to get neater with it in time. The quantity seems right as well.