Mr. Do! (Japanese)

[ColecoFan1981]

Is it true all versions of the Japanese Mr. Do! arcade game, there known as Yukidaruma (lit. "snow man"), are the same?

Here's the supposed prototype for the snowman version:


And here's the final version with Do! now as the clown:


When you listen to the music, much of that inspired the music for the ColecoVision and Atari 2600 ports of the game - which makes me ask you this: why did Coleco base it on the prototype version instead of the final U.S. version of the game?

The ColecoVision version's music consisted of:
MAIN BACKGROUND MUSIC goes to the YUKIDARUMA version
LIFE LOST jingle is also from YUKIDARUMA
LEVEL COMPLETE jingle goes to the arcade version's NAME ENTRY music (all versions)
ALPHAMONSTER+MUNCHERS music is just simple noise-channel beeping, not used at all in YUKIDARUMA

~Ben