Fact: Crazy Kong was based off of dkongjpo roms. Hence, the ladder cheat, the barrel skip cheat, the 1234 level order, and "HOW HIGH CAN YOU TRY". these don't count as differences.
Actual differences.
1) there seems to be a smaller sprite limit on the crazy kong boardset. this affects the following.
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1. Did anybody ever notice that the conveyor belt rollers, found at the end of the belts, start off a the letter Q? LOL
2. All of the sprites hover about 2 or 3 pixels above the floor. Different versions vary in the number.
3. The destroyed enemy debris (from barrel or fireball) do not disappear until the sprite is reused.
4. You can jump on the place where the far left elevators come out of without dying, as long as you don't jump while the elevator is overlapping Jumpman.
5. If you do not use either hammer on Rivet screen, you are rewarded with gold bars. (Pt 2)
6. You can also clear level 1 by jumping off of the oil can (This is something I haven't seen mentioned anywhere). You can't even stand on the oil can in DK. (I can make a YouTube video if anybody cares to see it.)