Yes, under IPC you may wet vent up to two bathroom groups (plus emergency floor drains in each bathroom) on one wet vent be it vertically or horizontally. Toilet, lav, shower or bathtub or shower/tub combo, bidet...one fixture each for each bathroom.
Something else......here in my neck of the woods, under IPC you aren't allowed to flat vent at all. The second drawing looks like you have a flat vent coming off the toilet.
I threw together a quick and VERY rough drawing. The toilet, lav and shower all come off the same horizontal plane as the branch. The bathtub is individually vented downstream of the wet vent. (Remember shower or bathtub or shower/tub combo.)
Good luck
P/S....I guess it wouldve helped if I sized the drawing, huh? Horizontal branch-3", shower-2", lav-1 1/2", tub-1 1/2", vent(s) 1 1/2"