Correct!!! If my memory has not failed I believe both of these to be .270" thick.
The FBM's can range from .250-.320" depending on it being a variant, FFBM, FBM-LE etc.
The FSH's can range from .250-.345" depending on regular FSH at .250, HHFSH at .270, HOGFSH at .320, and MOASH at .345"
ONLY thing is that this is a rough guide! Jerry has made many knives and when someone say a HHFSH is .270, it can range from +/- .005ish. Same goes for all of them in that nothing is set in stone. Also regarding the HHFSH blades there has been a run of them of late that are Full grind instead of Saber grind, ah I know let the confusion con't. Are they considered a HHFSH or a FSH-Variant, don't know myself. Hey that is what is interesting about all of this. It makes you want one of each variation!!!
Just go with the flow and get one of each...