And because the pass phrase is different, they are not able to be linked together!?
Discussion
Right. They're completely different wallets.
BIP85 is another very cool feature that coldcard supports. It allows you to derive a new 12, 18, or 24 word seed based off a master seed. If one of the derived seeds is compromised, the master cannot be determined. However, as long as you have your master seed, all derived seeds from that master can be recreated.