Sorry, I couldn't think of a shorter title for this question.
On Programmers.SE, I frequently see questions which have been migrated there from SO. Sometimes there are a few people who have answered those questions who do not have Programmers.SE accounts, so their name is grayed out. And sometimes those answers have quite a few upvotes, or are even accepted.
I am just curious, if one of those people later makes a Programmers.SE account, will they receive that reputation? Or is it lost forever?