it depends what is your cell element identifier in your O&M databases. If each cell is defined per LAC/CI, then that’s possible.
For instance, in Alcatel-Lucent, there is 2 modes of identification (in RNO, NPA and NPO, for instance): either per CI or per LAC/CI.
First solutions (only CI), if there are 2 identical CI’s in the network, the NPO will detect a duplicate CI. But the cells are still operational from a telecom point of view.