Blue pearls are a different sp. yes.
Blue Velvets were derived from Red Rili. They still have reds pop out in their offspring but 99% of the red dissipates after the juvies reach adulthood. Here's a recent thread I made regarding my offspring Blue Velvets with red headgear. Check it out if you haven't yet: My Blue Velvet Shrimp. Red headgear offspring!!