v13.0 bundle ids match in both mitre/cti and mitre-attack/attack-stix-data, but content is different

[watgh]

when we build a copy of the attack website for our sneakernet enclave, we typically use the mitre/cti copy of the stix. But our mirror of this site is behind so I saw that the "same" file is in mitre-attack/attack-stix-data. The bundle IDs are the same, but when looking at the source repos I discovered the content is very different. How can the bundle ids match!?