Do PTFE bars work with regular body jewelry of the same size gauge? Can I cut the bar down on my own?

I have had my cheeks pierced for a while and I have decided it is time for a change. The balls are screwed on pretty tightly so I don't want to bother taking them off if I can't change them. I'd really like to know if the PTFE bars can work with the same size gauge accessories or do I have to use internally threaded jewelry or a specific type besides the ones I've mentioned. My second question is can I cut down the bar on my own with scissors or a razor blade or do I need to go to a body-piercer? I've never had a PTFE bar before and I'm otherwise really knowledgeable with this subject so I feel kind of stupid asking these questions. I'd prefer someone answer this who is 100% sure and may actually be a body piercer. I'd really appreciate someone answering this that actually knows what they are talking about. Thank-you in advance.