Having hatched out some bright pastels and a couple of Pastel enchi's I can tell you that there is no mistaking a pastel enchi even right out of the egg. The color and pattern are so different from a normal pastel that you can spot them from twenty feet away.
either the seller didn't know what they were looking at or they are just losing it..
But to answer your question I'd say it looks like there is something else in that animal Enchi maybe, or even fire or Vanillia..