Using 2 RPD files on the same server through the same OBIEE tool

Hello Experts,

I am working as a Solution Architect at a global enterprise tech vendor.

I have 2 RPD files, a.rpd and b.rpd. I need to switch between these 2 RPDs on the same server and through the same OBIEE tool.

Do I need to deploy both RPD files on the server to switch between these two through the same OBIEE tool?

As per my own attempt, I can open both RPD files through Administration (obiee tool) : File --> Open-->Offline and without any deployment.

Is it mandatory to deploy both RPD at server to open it online?

I guess I need to define 2 different ODBC system data sources for my repositories after deployment.

Thanks.