Maybe if it was like, a mix up discovered fairly soon afterwards. Otherwise, no way.
My daughter is my daughter. If I found out tomorrow she wasn't really mine, there is no way I would trade her in for some random kid I don't know but who shared genetic matter with me. I know them no more than I know any random kid.
I think it could potentially be really traumatic for children to be "swapped," as well. Imagine being so little, trusting and loving your mother and father... only to just be handed over to some other couple and that's it! No way.
Even just watching DP and DD proves to me that biology is not really that important. He is SO MUCH more of her father than her own father is... the bond they share and the relationship they've built proves they are family. The fact she didn't come from his sperm doesn't mean squat.