Simple question that is hard to answer

[peter]

Hi group,
I have a question regarding incompatibility of plasmids. Can one
bacterial cell be transformed with more than one plasmid (of the same
kind) and keep these plasmids. For example if one has two clones (same
insert, same vector) can they co-exist in the same cell (same size
too, only difference would be point mutation). Your thoughts are
invaluable and much appreciated.
Peter