Nah, it uses the Predator's handling.
...
# Id, Model name, Txd name, Type HandlingId Game name, ...
...
120, predator, predator, boat, PREDATOR, PREDATR, ...
...
150, ghost, ghost, boat, PREDATOR, GHOST, ...
end
peds
...
I think the Ghost was added in the "last minute" to the game because it is the last at the vehicles.
About the name I think Rockstar forgot about it but they fixed it in the PC version but I've got no idea why did they give it a name like that. Maybe it's a reference to Ghost Town?
Also, this vehicle is unique to Grand Theft Auto III.
And I think they changed the color because the light blue one looks strange.