Isle of Man 2000 Crown (ISS) Listed Twice in KM?

Does anyone know the difference between these two coins? Or did they accidentally list the same coin twice? The only difference I can tell in the listings is the PM mint mark, but every example I've seen has had the mint mark.

Just a doubled in Krauze. Not a first time, however in most times they assign second number by error to similar coin from the other year. Here two different km# with the same year.

Thanks for info, I will add second reference number too.

Currently in Numismaster KM# 990 is dated 1999 and KM# 1264 is dated 2000. But the only picture of a coin is KM# 990 and it shows a 2000 coin. What a mess.

Not exactly 1999… see at the bottom for the yearlines: it's still 2000 only. Yes, it's a mess. Multiple cases like this unfortunatelly.