As per
this thread, I just did some handy-dandy scripting and compared the vgmdb catalog list against the gmr catalog list. Note that this doesn't account for stuff like "there's a dash instead of a space" or whatever, but it did manage to cut GMR's list of 6500 down to 2145, so I'd say that's significant. As people reply to this thread with updates, I can cut things out of my post so we can see only what's left. Since Kaleb mentioned starting at the top, I'll start with Z and work backwards.
So yeah, if you add any entries as a direct result of this listing, please just post a reply with which ones you've finished adding.