Very interesting! Does look like they revised the 138 in 1 and added Metal Slug X, then removed those two plus versions you mentioned. I wonder if they fixed NAM, League Bowling and Cyber Lip VROMs? I doubt it! Would be interesting to see if they put caps and regulator on there - again I doubt it!
47uF caps for smoothing will be OK, larger is better though.
What's wrong with those games? I thought there were fixes for those games? or do you mean you wonder if they work straight from the factory.