Of course it's much better, Schongauer was ~25 when he did the engraving. Michelangelo was 12 when he copied it. Likewise, it goes without saying that Haydn's symphonies circa 1765 were much better than Mozart's from the same time, since Haydn was ~30 years old and Mozart was ~10 years old.

The remarkable thing about the early painting/symphonies isn't the absolute quality of the work, it's that they showcase the artists' intrinsic baseline talents, which they would then leverage as their skills improved with maturity to become some of the greatest artists of all time.