Rambi's running speed is 1008 in DKC, but only 768 in DKC2.
The number means how many subpixels you are moving forward every frame. One subpixels is 1/256 pixel. So 1008 speed is slighty less than 4 pixels/frame and 768 is 3 pixels/frame.
When you use the charge attack in DKC2, Rambi's speed goes up to 1798, which is 7 pixels and 6 subpixels/frame.