Can i order 2 wedding cakes from different bakeries?

Sure why not! I am ordering a groom's cake from one bakery and then our main cake from another bakery with different flavor profiles

We're doing that. We're buying a small cutting cake at a bakery, and then buying a full slab cake from a good grocery store for guests. No problem with doing that, and very cost effective in my eyes.

I'd just straight up ask both then if they have any exclusivity provisions in their contract. I can definitely see how some vendors might, but then others do not. I think it varies a lot by vendor. Daughter's baker (a small, independent cupcake shop that also does wedding cakes) barely had anything I'd call a contract. They wrote out the order specifications on an order sheet and attached a copy of the receipt to it -- that was it, and I'm pretty sure we could have done anything else and they would not have known/cared. But there were other bakers daughter considered, including higher-end, very much "specialty wedding cake vendors," who I would not have been surprised if they had a more detailed contract and exclusions. You don't have to necessarily say you'll have another wedding cake, but just ask if they have any restrictions regarding desserts from other vendors.