No, Cobalt Blue and Sapphire Blue are
different
. I saw the two blues in the leather book and Sapphire is a darker shade. That's why I'm really confused about Cobalt Blue vs. Royal Blue because I know they're also different but I hadn't seen Royal Blue live so I don't know how the shade is in comparison to Cobalt. They SEEMED really close in shade because the SAs are always confused about them - both times they have to check the tag.
My only knowledge of Royal Blue is from looking at pictures. If the shade of Royal Blue Ostrich on the computer is what it looks like in real life, THEN Cobalt Blue Ostrich is a bit darker (it's got more of a blue tone while Royal Blue looks like it has more of a grey tone). However, since I've NEVER seen Royal Blue ostrich live, I'm really curious. Btw, I LOVE Royal Blue, it's a gorgeous shade of blue especially in ostrich~~