Zoro has always treated Chopper like a little brother, so it would make sense for Chopper and (injured) Zoro vs Queen to happen. Meanwhile Sanji fights King
Zoro only came to Chopper's rescue once in the manga guys. It happening with Ohm does not suggest it's happening with Queen lol.
In fact Zoro needing to heal could suggest Sanji would be the one to save Chopper since chances are he loses faster than Zoro takes to recover. Maybe Chopper is needed to heal Zoro after the fact. Maybe Marco's fight with King lasts far longer.
People forget that Zoro fought Kaku (+Jabra temporarily) for like 10 chapters before having his 2 chapter fight with Kaku. Sanji literally only got a 2 chapter fight with Jabra. Maybe the vice versa happens here, where Sanji's fight starts much earlier than Zoro's.
Think about all possibilities, not just one where you try to allude to a particular matchup