Usually it’s best to adjust the processed version level DOWN to the level of reference version because raising the reference version to the processed version will induce some limiting/clipping and that makes it hard to really compare apples to apples.
So, the best way to compare your work in progress which is usually louder than the source is to turn down the processed version.
This would require some kind of Smart Bypass system to work inside the montage itself. I have very little experience with Smart Bypass in the master section since I don’t use the master section for any processing ever.
I’ve been meaning to see if there is a solution somewhere with Metric AB and/or Ian Shepherd’s Perception plugin, but haven’t had time. Maybe I’ll look into it soon.