Taking preiously upgrade 4tb had drive from Roamio+ and swapping to Roamio

I want to take out my 4tb hard drive in my Roamio Plus and swap it to my regular Roamio-have lifetime service on that. Since they are both Roamios, can I swap them and the recordings will be untouched, or will it wipe out the hard drive when I install in on the Roamio Plus? I hate to transfer ie. "kmttg" 4tb worth of shows to other hard drives and then restore them after the 4tb is installed.

Taking preiously upgrade 4tb had drive from Roamio+ and swapping to Roamio