How to migrate /etc/shadow entries from one version of RHEL to another?

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Issue

I'm migrating a bunch of user accounts from a Redhat 5.x system to a Redhat 6.2 system. Can I just copy the /etc/shadow file over to the new server or is the format different in Redhat 6.2?

Environment

Red Hat Enterprise Linux 4
Red Hat Enterprise Linux 5
Red Hat Enterprise Linux 6
Using shadow passwords

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