You can use the same Audio files that you have on your distribution account! After you have created and saved a quote on the Manufacturing site - https://duplication.cdbaby.com/quoter/default.aspx,
Select the Content section and then set your submission method as "Use master from CD Baby". You'll be redirected to your Distribution account log in page to log in and select the album you wish to use the files from.
Artwork needs to be set up differently for physical media and so you won't be able to use the sames files as your distribution account. You may be able to use the same images (using the Design Online submission method), as long as the resolution and quality are high resolution.
*Note: You may need to register on the manufacturing site, since your Artist log in does not sync up with this site. They can be the same, if you set this up when you register.