No. He was never a part of the MK Haunted Mansion lore. Only Disneyland lore.
He should be left on the West Coast, where he had (at least according to rumor) a home.
Hatty is unique to their version of Haunted Mansion, as was the lore of it (there was never fan lore that he was in the MK version, because it's quite clear he never was...).
We have the Escher stair room, they have Hatty. We have animated hitchhiking ghosts, they have two pet cemeteries (for the time being). Attractions cannot and SHOULD not be the same at every park, even if they are the same general theme.