Compatibility of 2017 iMac Pro SSD with 2019 MacPro

MacBook Pro from 2019 uses T2 chip, which uses a small portion of built-in storage as an extension of the Secure Enclave. If you attempt remove or replace its built-in storage, you've left half of its brain on the table, and it can't ever function as a Mac again.

The drive modules use the drive controller built into the T2 chip, to preclude ANY direct writing to the devices. The module has ONLY the storage devices, NO controller. So these are NOT standard drive parts.

Apple may offer some drive upgrade swaps as a service, but NOT as parts, because information belonging to the T2 chip must be set aside and restored.

Mac computers with the Apple T2 Security Chip - Apple Support

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It can work, but it is reccomended to use parts that belong to your computer and not to interchange them