I may be a bit late to the party here, but if it were up to me I would either grow them both, or snip one. Trying to separate them is likely to stunt them both, and digging or pulling one up may damage roots and stunt the remaining plant. As to growing both, it might work, but I have never grown a multipot with two plants so intimately tangled. My current multis were all planted separated by cardboard barriers to keep root balls from getting too mixed, at least initially before the cardboard broke down.
Good luck with it.