I wouldn't worry if I were you. Sometimes my animals will refuse feed because they are about to start a shed cycle. I think there is about a day or two that the snakes have started their cycle but it is very difficult to detect visually because they are not cloudy yet. Usually, the belly is the first place to see them getting cloudy. I always check there if I can tell by a normal inspection.
Usually too, sexually mature animals, will stop eating in the winter. My males always shut down first, usually in November. (they know when it's time to concentrate on other things) Then, after some breeding activity, some of my females will shut down. Some of my females will continue to feed through the winter though, until ovulation. I will continue to offer food the ones that will eat, making sure that temps stay suitable for digestion.
It's too early to say that they have both shut down for the winter but if they have BOTH shut down now, you might want to make sure that you do not have two males.
Let us know how it goes.
Tom