You are attempting to import a cert with the same issuer/serial as an existing cert, but that is not the same cert.
Tajin natojtob'ej najïk' el jun ruwujil b'i'aj, ri junam rajilab'al rucholajem/tikirisanel tzij jun ruwujil b'i'aj, ri k'o chik, xa xe chi man ja ta ri ruwujil b'i'aj ri'.