The answer is the same. iThoughtsX exports OPML and it exports Freemind (.mm). Try both. I think you’ll usually have better success with OPML exports, but YMMV depending on the mind mapping application. OPML is a very loose standard which some developers use well and others treat as an afterthought. (E.g., OPML exported from DEVONthink is not canonical at all.)
So, you just need to try it.