Two CR-10s running side by side. One is loud, one is super quiet

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So I have my CR-10s I purchased back a few years ago. It has been running at what I thought was a normal noise level.
I recently inherited another Cr-10s from my brother who purchased this a year or two after mine and it is so quiet I don't realize it is printing until I turn around and see it in progress.

There have been no stepper driver changes or mount sound deadeners. It's even running on the black box from my original printer.

Stepper motors seem to be a mix between Creality 42-40 and 42-34's which again, appear the same on both machines.

Any ideas where the big difference is?

Thank you