Yes, but when you have a disagreement about the facts, you can say one of the statements is not true. (Hence perjury, which is not disagreement, but is a felony. \
Note that I am not saying Trump will be the one who is committing perjury, in actuallity they hate him so much that they could be lying and Mueller will still have his “case”.
I would hope very much that Trump does not take the interview with Mueller.
Yes, people can be found guilty of anything. But Trump would, if impeached, tried by the Senate which is in republican hands. And there’s little chance of impeachment with the House. And an even less chance of guilt even if he
Also remember, since Trump is President his prosecution vehicle is impeachment. It's unlikely a Republican controlled house would impeach him unless the crime is horribly serious and simply couldn't be avoided. And it's even less likely the Republican controlled Senate would convict him.