My experience is that most bra sizing varies 1 cup size and/or 1 underbust-circumference size from brand to brand. Don't know if VS varies more than that as I think I've only bought one of their bras, ages ago.

Even allowing for that, my size seems to change every couple of years now, so I need new bras now too! And at the prices they charge, argh!

Enjoy your pretty (I'm sure) and well-fitting bra, and your other fun stuff!