Time Machine: Old Computer / New Computer

I had been backing up my Mac Mini to an external drive using Time Machine for a couple of years. I just got a new iMac, connected the same drive to it, and am in the process of running a back up on it. Whne I open the external drive folder I see one file named 'Backups.backupdb' with the current date/time in the 'Date Modified' column.
I don't think I just overwrote my 2 years of back ups from the Mini (which WAS going to be my question) since there are 2 directories in that 'Backups.backupdb' directory - one with each computer name. The question becomes how to restore files from the old computer to the new. Do I have to now search for them directly on the external drive (i.e. not use Time Machine to restore)?
After 2 years of working with it Time Machine still has me a bit confused,

Use the Migration Assistant to import them.
(65416)

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