Well they actually mention that in the listing, along with the new ones having chrome spindles, not black.
But I believe they should have some different stamping on the cages and markings on the bodies to avoid the re-birthing of old orphan parts.
I agree with you. I have BM10s but they are a little different where they're stamped etc... these look stamped the same as the og BM7s and not sure if the body is different too.