Can I use the same user accounts for both Lion & SL?

I have one Mac that I can upgrade to Lion but it is the one that the entire family uses every day (I only can use it (and administer it) on weekends), so I have to make sure that there are no problems and no issues so my plan is to:
Move all of the users accounts to a different drive.
Configure 10.6.8 (SL) to use the user accounts on the different drive.
Back up SL to a bootable drive.
Repartition the Mac for a SL & Lion partition.
Reconstitute SL on both partitions.
Upgrade one SL partition to Lion.
I should now have a partition for SL and Lion that both use the same users accounts so when I (and then my family) are comfortable with Lion, the switch will be transparent.
Any problems that I am unaware of (and how to remediate it)?
TIA.

There are a few discussions here on the topic that I was planning to employ:
Moving Home folder to different HDD From Mac OSX Snow Leopard via Terminal?
Moving some Users to different volume
How do you move a user account to a different drive?
Another way of doing it is to move the directory, and then alter the user's home directory using the NetInfo utility (Tiger) or Directory Utility (Leopard). In both, you can change the user's home directory from the command line in Terminal.app like so:
$ sudo dscl . -create /Users/user NFSHomeDirectory /Volumes/volname+/+user
In the SL System Preferences -> Accounts one can select a user's account, right click and choose Advance Options presents the screen below. This is how I intend to point each OS to the same user account on an external HDD.
Does that answer your question?
TIA.

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Can I use the same user accounts for both Lion & SL?

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