I can tell you about SEQU to SEQM.
SEQM: Old Mariscal Sucre Intl. AP in Quito, Ecuador, IATA code: UIO. Now closed, and replaced by a park. In P3Dv5, it is not in the ICAO database, but is still shown on the P3Dv5 map view labeled as SEQM, and they have a park correctly replacing it in the scenery.
SEQU: New Mariscal Sucre Intl. AP in Quito, Ecuador, same IATA code: UIO, but is 11 miles away from the old SEQM, and now a new airport in the scenery for v5.