Hmm, they are pretty similar TBH. I think the first one is the single-layer because in the soft passages it sounds brighter than the other demo but it could be that there’s an EQ applied to it to darken it. I can’t really bet this time. OTOH, as David said they are both kind of weird, for me personally in the overly exaggerated dynamic contrast in that moment when there’s a sforzando (sudden fortissimo) going forward, kind of unrealistic, like the sound is amplified rather than keys being played with more force.
Yamaha have been using single layer piano samples in their entry level P-series for ages and it’s acceptable, much better sounding than what one might expect from a single layer.