PMax and AI Max both running - how do you tell which one brought the traffic?

I have a PMax campaign and a search campaign with AI Max enabled, running at the same time against the same catalogue. Both can now match queries I never specified. Both write their own creative. From where I am standing they are competing for the same searches and I cannot tell from either report which one won a given auction, or whether they bid against each other on the way. Has anyone worked out how to separate these two? Or is the practical answer to run one and not the other until the reporting catches up?