Secondary and Tertiary DNS config

Let's say I have three dns servers. I think that I have to configure BIND differently on one of them to designate it as "primary", but can I config the other two as just slaves, or do I have to somehow explicitly declare each as secondary or tertiary?

In other words:

Can slave DNS servers be freely interchanged as secondary or tertiary (or fourth-iary) without reconfiging them?

or:

Can I go to my registrar and just change my secondary DNS server to be my tertiary DNS sever and verse vica?

or do I have to do something to their configs to make them know whether they're tert or secondary.

thanks

 

 

 

 

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