Golden Axe is a budget release, probably uses original cart labels, but anyway - Sega Classic releases has it's own rules.
Sonic Spinball - manual on your link is wrong, ESRB Sonic Spinball release has b/w manual with ESRB rating, but not on cart.
Here is the correct one - https://www.ebay.com/itm/Sonic-The-Hedgehog-Spinball-Sega-Genesis-Video-Game-Complete-in-Box/143587878348?epid=2255131982&hash=item216e8125cc:g:J9sAAOSwCr9eofOY:sc:USPSFirstClass!19720!US!-1
That's would be great!