I have them with habrosus corys, they seem to get along fine. (they are similar sizes, though, that may be why)
Funny thing is, every so often you would see a group of CPDs swimming by, and a stray (or two) cory would join in on the group (possibly mistaking them for fellow corys?), swimming peacefully together for a few seconds until…
bam, CPDs suddenly realize they are not the same kind, and the group disperses in a flash…
But then again, this happens when there are only CPDs (sudden dispersal during group swim), so it doesn’t seem to be stressing them out too much