There are many options in Roon that determine how it sounds. Not all are categorized under DSP (which is optional to use).
My point is, if one really must, before comparing Roons, one better have a good handle on all the ways how you configure Roon that can affect the sound, in order to be able to truly compare apples/apples.
Roon is very powerful and flexible in regards to how the user can impact the resulting sound depending on settings. It can be a little overwhelming frankly at first. So lots of ways to use or abuse Roon merely based on what settings are in play. Start with default settings and tweak from there as desired.
Personally I would not worry about what other Roons sound like until I have used teh one I have to full potential for best results.
Learning and understanding what all those optional settings actually do and which might help versus hurt may seem like a somewhat daunting task, but one that is most worthwhile mastering.
It can also be fun and educational just changing settings one at a time and comparing. You can always reverse each step along the way as desired.
Doing room correction correctly with DSP alone is a total game changer in many cases, but doing it right takes some learning, time and effort.
I’d recommend best practice of first adjust for the room (often good sound public enemy #1) , then you can layer other filters on top of that to tweak the sound as desired to personal preferences. Roon users have documented how to do this using Room EQ Wizard freeware. Just google search Roon room correction