This guy tested Grimm, Innuos and HZ as roon core(!)- imho the results are really interesting!
Even on youtube, you can spot the difference (not sure if he does some upsample etc)
On this forum I would say half feel Mosaic sounds better than Roon, while the other half feels things sound the same.
I have no idea who this youtuber is however I will be interested in reading some of the inbound comments from those technically more astute than I am.
If one is in the camp of Mosaic sounding the same as Roon, I would think all Roon Cores should sound the same?