Haha, apparently I already did this (and didn't remember doing so), according to this page: https://www.dreamwidth.org/openid/claim . I assume this means I'm good as far as imported-to-DW stuff. Thank you for the explanation!

I somehow thought this would mean I could login to one place (i.e. DW) and it would also log me in to the other, but it appears I am incorrect (or else LJ has disabled the feature?). At this point, though, I don't think I care. LJ has pissed me off enough times that I would have deleted long ago, if it weren't for the few remaining friends on there who have not yet migrated.