Those definitely look like Picasso percula although these days there are a lot of vendors and hobbyists selling hybrids without labeling them as hybrids. If the origin of them is unknown then you might never know if the bloodlines are pure or not. I suspect in the future there will be a muddying of percula and ocellaris. To me the question of Picasso/Snowflake is really a question of percula/ocellaris. As far as whether they look like Picasso or Snowflake they definitely look like Picasso. If you want to see some examples of each check out my website Untitled Document
I think all clowns have a tendency to prefer different types of anemones, though I couldn't tell you which is which (I've done some research on clowns so I can get a pair for my hubby and myself.)