Yes, you can use FW from MTB.
When we execute "Build [Project Name] Application" on Modus2.x,
FW (including .cgs file and Patch file) is automatically written.
Is this understanding correct?
Do we need any special settings for the CYW20819A1KFBGES2 IC?
No special settings needed. You can use it as when you normally download FW to 20819.