I've used Cryo-Mosaic and Cryo-Citra, and as far as I can recall, they looked the same as T90 pellets, but the aroma was much more intense. It'd be pretty sad if you needed to open both packages and smell them to tell which is which.
When you say they're unlabeled, do you mean they both say "Mosaic" or they don't say anything? If they don't say anything, I don't think I'd ever order from that place again. That just seems like a really, really bad policy. Obviously if you ordered Mosaic, Citra, Fuggle, Tettnanger, and El Dorado and none of them came labeled, that'd be a huge problem, but even if you only order 1 hop and it came unlabeled, in my case, that'd mean I'd need to create my own label for it since, like many homebrewers, I store hops in my freezer, so no label means I have no idea what variety it is or what it's alpha acid content is. And 5 ounces is a decent amount of hops too.