Yes, I wouldn't have any problems reusing a sabot that was pushed down, then out later. I had heard one guy talk about 'matching up the rifling marks to the used sabot'. That sounds a little more difficult to me.
If you look you can get sabots matched to about any common bullet sizes, for good bore fit in your gun. I'd start trying some to get supplied for the future. My usual is a 'crushed rib sabot' for a .451-.452" bullet in my Knight. My experience is T/C has on average a tighter bore.