[Samba] two sambas on one machine?

[mlh]

Hi,
I want to run two Samba servers on a single machine
during a transition from NT domain to W2k AD server
setup.   And samba 2.0.7 to 2.2.5.  And NT wkstation to XP.

To do this I'd like to run the two versions of Samba simultaneously
on the one machine.  I figure this would be easy enough if I
have them bind to different listing addresses.

However, since the two servers will sharing the same shares,
will there be a problem with locking?
Or will it be ok, since they both just use the underlying Unix
locks?

Has anyone done this?

Regards,

Matt
PS. Another possibility that occurred to me is the have the
second server on a second machine NFS mounting the first.
But I think this would be even hairier.