Can I use both Blackmagic RAW plugin from BMD and BRAW Studio ?

No they are fully incompatible. More information here : BlackmagicRaw Plugin and BRAW Studio - What's the difference ?. Please note we are only talking about the Adobe plugins from Blackmagic RAW. You can use Blackmagic RAW Player and the thumbnail previewer along with BRAW Studio there's no incompatibility. We even have a checkbox in our installer to install them automatically !
Go back to BRAW Studio User Guide
If you're running Apple silicon (latest M1 CPU) please read our article about compatibility with Adobe !