I'd assume that double jeopardy would no more apply in the case of an impeachment than it does in the case of civil prosecutions alongside criminal ones.

Trump could beat the rap for insurrection in the Senate, and still be found guilty in a criminal case, and the other way round. And in either case, he could still be open to related civil charges for harm caused by his actions. And that's aside from the other things that could be brought against him, civil and criminal.

I think he's going to have a pretty busy time.