Red Skull = Cap in terms of fighting and strength.
And KP owned Cap in a comic before. He'd do the same to Red Skull in a H2H match.
Leader/crimelord it's a toss up. Red Skull plans were all take-over-the-world type stuff. KP was more locally based around money and taking out heroes for personal vendettas. Both smart, but different forums of play, and thus hard to compare.