Can I switch external hard drives and still access old Time Machine backups?

I have a Mac Book Pro linked to 2 1TB external hard drives, one used as my Time Machine Back up, the other used as a manual ad hoc back up and to store even older files.
The TM back up drive is now full. If I just unplug it/switch it off and plug in and set up a new 2TB hard drive as my TM back up, will I still be able to access the back ups on the original TM drive if necessary, through TM?
Wil it be a start over situation with the new drive, performing a complete back up to begin with?
Or would you advise me to transfer the old back folder to the new drive, given that it will be larger?

Hi den.thed,
Thank you for this - I think the easy option by far appears to be to leave existing backups on disk 1, and plug in disk 2 and start over.

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