First, under Texas law (and the law of most states, for that matter), there is no obligation to pay unused vacation out when employment ends, unless there was a written contract or unequivocal written policy to that effect. So as a general matter, there's rarely an obligation to pay out vacation time. Second, if you are working for the same company, your employment status has not changed--i.e. it has not ended. You should have the same vacation, subject to the same terms, as you did pre-relocation. In no state does relocation (while working for the same employer) by itself trigger any changes in vacation.