This might also be a quick way to spot check.
Some SNKP PCBs from that era have
SNK and
Playmore etched on the lower board, on the back side, by the connectors. The MVS Scans of the KOF2K3 have this feature, so I would assume the AES version also has this. (I had a copy of the game WAY back when it first came out). The pictures below are from my AES copy of SVC Chaos which released in that time frame.
Weight is also a good way to spot check - EPROM conversions are typically a little heavier than an authentic cart in my experience, while a reproduction will be noticeably lighter due to hardly any chips being used.
I agree with awbacon, though. I think you're good to go.
20200416_094031.jpg
20200416_094045.jpg