No idea on that one. I never installed the newest version, but would assume it can also be used in SONAR. Cakewalk has locked some things to newer SONAR versions, but Breverb was present in the SONAR package previous to CbB. Hopefully someone can comment about that specifically for you.
If you do a Windows Restore Point prior to installation, you should be able to back out of the latest CbB update cleanly if you want to test it. An image would do it for sure, but that may be overkill for this.