Repot?

I would be tempted to pinch off (kill) the smaller plant. It is so much smaller than and is close to the bigger plant. I would not risk damaging the bigger plant especially if it is a auto. If it's a photo you can veg longer so it can recover from any damage. If you want to save the smaller plant you can. Know that the roots of both plants are probably already intertwined. You can either cut/dig straight down between the two cutting the roots. Or you can dig from the outside and try gently wiggling and pulling to get the smaller plant free. Once it's free be ready to immediately put it in soil. You do NOT want the roots drying out at all during the transplant.