actually, never mind.

Marvel confirmed today that the Carnage story they teased in Web of Venom is going to be a Major Event where Carnage Fights everybody, which was implied but not confirmed before.

It's been stated that Carnage is stronger than he's ever been and considering that his goal is to collect Symbiote Codex's and eat them to gain the powers of other symbiotes and their hosts in order to become strong enough to go on an intergalactic murder spree, it's likely that he'
ll be stronger by the end of the story that he was at the start because there's gonna be some d-lister casualties or something.

Which means that Carnage is getting a story very similar to what Doomsday's most well-known stores are--Major crossover events against multiple high-level heroes--which combined with the "monster than can only be temporarily stopped, not killed and will get stronger by next time" thing means that they're thematically similar enough that I could see DB deciding to do Doomsday v Carnage.

I mean, they'd give Doomsday the win even if Carnage did pull a feat out of his ass that should have let him one, but it's plausible that it could be a matchup now.