I've been meaning to put this comparison up for a few days. I couldn't find my Cornflower Blue Tank - it's in a sell bag at the moment - but when I do I'll add it to this post. Lakeside Blue Strap It Like It's Hot Bra and Porcelaine Blue Cool Racerback. I think the difference between the two colors is a bit more distinct than illustrated in this photo but they're pretty close. This was taken in indirect daylight.
This was taken in the dressing room with my phone flash. The bright blue on the left side is Kayak Blue. The Porcelaine Blue CRB is underneath the Lakeside Blue Strap It Like It's Hot Bra.