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No. It won't be possible to access drive A if it's slaved to machine B (and you booted from the drive in Machine B).
Drive encryption uses a boot-drive specific key. All drives on each system are encrypted with a unique key particular to that system.
Each allocated user has a copy of that system-specific key encrypted with their personal user key.
So, you can't move a 2nd drive to a system using a different boot drive - the encryption keys are different.
If you want to access a drive, you need to either boot it, or boot up from a CD/USB stick containing DETech (which can load any system key).
If you slave a drive from Machine A on Machine B, then boot machine B from a WinPE DETech CD/USB, you'll be able to access either drive, but not both together.