I did some research when I still had my copy of Mega Collection and learned that by default, it will play the Japanese version of Sonic 1, unless a command is entered to switch to the US version. I need to point out some differences to prove that the points runs for them need to be split for fairness.
US:
Timer returns to the time you were at when you hit a checkpoint after a Time Over
Final boss gives no points

Japan:
Timer returns to 0:00 after a Time Over, if a checkpoint was touched, thus more points in Marble 2.
Final boss gives 1000 points.
Don't get me wrong, my rivals' scores are valid, but I feel a split is needed.
Anyone able to make new variations?