Someone should really sticky a thread about board measurement and why your quasi isn't actually short (cnc is usually pretty accurate) or your bbs isn't actually long, they're just measured differently.
I know it does come up from time to time, as if there should be a key to go with certain brands, or at least help with things, eg:
WC = measured with the concave
SA = measured straight across
That can have some significant differences like this:
PS Stix Quasi boards in 8.25 width are listed as 32.25 WC and 31.85 SA
BBS Real boards in 8.25 width are listed as 32 SA which would be 32.35 WC
Edit:
General consensus is the measurements should be straight across, as per most of the information about boards from almost all the major and other woodshops, brands and shops nowdays, which is why in some cases there is confusion over the actual lengths of boards, if they are measured differently.