this thread also has the 2 different trailers for comparison, which are synced up if you play together, so it's easy to compare the Quest graphics to the full PC version
The 2024 remake of Riven is launching for PC, PCVR, Meta Quest 2/3 on June 25 2024.
www.neogaf.com
I'll be tempted to just get it on Quest3 for the convenience, although there's some obvious graphical reduction, particularly water and effects.