Correct. If you want to use Simbrief and have the same navdata in the sim, you need a Navigraph sub. Otherwise, you’re using 2 different nav data sets that may not always match up.
It’s not just AIRAC version. Simbrief / Navigraph use Jeppessen charts. MSFS uses NavBlue. Not sure if it’s the core data from NavBlue or how Microsobo massage the data, but their data doesn’t match Jeppessen very well in many cases. There are omissions, errors, etc.