UPS hires lots of people from other airlines, the military, and elsewhere. What they are looking for is a well rounded pilot who will eventually be a Captain.
Retraining is a fact of life and you will learn to do it the Brown way despite any previous experience.
What or where you flew before is not nearly as important as your level of overall experience and ability to get along with people. That said, a certain level of flying and life experience is a given with anyone expecting to get an interview.