https://www.korg.com/us/products/synthesizers/grandstage/specifications.php
I assume so it is the same SGX-2 engine that is in the Kronos but I have heard people say it sounds different or better but have never played one myself just heard demo's.
I know you have more choices of different pianos Austrian, Fazoli, Italian, and the Grandstage that are not in the Kronos but you can purchase them at the Korg website for the Kronos. Also an Upright Grand is included in the Grandstage.
From my understanding most people prefer the German Grand which is in the Kronos.
Downside for me is if I want a stage piano I want it to be a modeled piano with alot of tweaking capabilities. I think the Grandstage is a sampled piano but the SGX-2 piano engine has it's advantages.