Yeah, basically SNK style has slimmer and more realistic proportioning for the body shape. The sprites themselves are also using deeper and darker shades and tones as well as more colors in general. And if I remember correctly, the light source is in the middle of the character, however not enough to make it look pillow shaded and shows much more definition in the muscles. SNK vs Capcom uses a lot of frames to make the animations really smooth, while some other SNK games have fewer frames, but are still very smooth in animation.