I believe that Shatterhand was the first version, and my reasoning for this is some of the graphics. In Shatterhand there's a spinning coin item, and in the graphics tiles all of the animation frames are side by side, which makes sense. However! Solbrain has different item graphics that doesn't appear to animate, but! It's still using all three animation frames like Shatterhand's spinning coin, except they're all the same image so it doesn't appear to animate.

If Solbrain was the original, that seems like a strange thing to keep in the game if they decided against making an item animate. After all there's limited space for graphics and they could just disable the animation code entirely.

Yes, and a whole stage got replaced!

This looks very similar to Shatterhand. Was it changed before coming overseas?