Same bounties.
Their bounties are based on their actions, not their crews. For example Luffy:
- 30 mil: Beat Buggy, Kreig, Arlong
- 100 mil: Beat Crocodile, forced WG to cover up the incident
- 300 mil: Infiltrated Enies Lobby, defeated Rob Lucci, escaped from the Buster Call
- 400 mil: Played a part in the Paramount War and survived
- 500 mil: Defeated Doflamingo
- 1.5 bil: Caused an "alliance" with Bege and Jinbe, Defeated 2 Sweet Commanders, and fucked over Big Mom.
These are exclusively credits given to Luffy. His crew gets their own bounties for causing related actions in an arc. Yes, sometimes the entire crew will get a commensurate bounty increase even if they weren't present (Dressrosa), but that's not everyone at everyo point. Only Luffy and Sanji got bounty increases at WCI.
"God" Usopp has 200 million because of his own actions at Dressrosa, not because of his crew.
So im pretty sure Mihawk's bounty is representative of his threat, regardless if he had a crew or not.