The OpenCelliD downloadable dataset does not have duplicate cells. Unique cell identifiers consists of four parts: Mobile Country Code (MCC), Mobile Network Code (MNC), Location Area Code (LAC/ area) and Cell Identification (CI/cellID). According to the example you shared:
- 405-51-8086-4112 is at 87.28981, 23.54727
- 405-51-6032-4112 is at 89.20967, 26.34247