Great question. In the rules, it states that the person posting here in PL must either be the photographer or the model.
So, short answer, Yes. If you take photos of models/businesses/products etc. and they want to use your photography on their account... then that is permissible. If you wanted to also post the content for your own display of your photography... that too is permissible.
However, posting the same content is recycling (as i'm sure you know)... so there would have to be a difference in how the content is formatted and posted about. If these accounts were all run by an individual or group of individuals... it could be considered farming for rewards.
So, not that you need a warning but for the sake of clarity and for others reading this response, open transparency and accrediting the proper sources and individuals in proper context is always the safest bet.
It is not stated in the rules, but if an individual had the proper legal rights to the photos then they may also be used.... but that wouldn't apply to 99.9% so i didn't write that one.
I hope this answer wasn't too overcomplicated!