So, I just dumped a copy of Carnival Games: Monkey See Monkey Do.

The checksum just so happens to match http://redump.org/disc/23435/.

So, what do I do now? The games have different titles in different regions, despite the disc being identical.

usually thats when you put the alt title in non-latin field so it's searchable
imo USA release should get priority since Europe could have regional names for every area its released in

I think its a case for a tilde:
http://redump.org/discs/region/T/quicksearch/~/

PX-760A (+30), PX-W4824TA (+98), GSA-H42L (+667), GDR-8164B (+102), SH-D162D (+6), SOHD-167T (+12)