Hey.
Wow, you weren’t kidding, that was a novel!
A few things to consider.
1) Both snakes know how to eat, and have had several meals.
2) It sounds like both ate live in the past, not f/t
3) They are in a new habitat
I would find out what substrate they were kept on before and put them back onto that until they start to feed more regularly. I'd also put them back on live mice as they were before. Once both are feeding more regularly, make small changes. Start with the substrate. Switch it to whatever you're using, but continue to feed on live mice. Then, after a few feedings feed a smaller live mouse, then try a small f/t rat. If they take both, then keep feeding f/t. If they don't eat for a month, don't panic. Just keep offering once a week. Do not start changing how you feed them, do not switch the tubs - those things just create stress. SMALL changes are the key.