On Swarmer's pic, it says "No Copy and Pasting - resizing... etc." but when I had a close look at the Nightmare in Dreamland's Sword Kirby and his Kirby, and resized the Sword Kirby to about the same size, they are almost the same, except for colours!
Well that's because he probably did the same thing as you, and looked at it and drew it pixel for pixel. Blocky characters like that are easy in paint.