Griifding: a cousin of Goofy?

[MIQUEU]

Hi!
I've found a story (I TL 2411-4) 
http://coa.inducks.org/story.php?c=I+TL+2411-4   where appears a 
character called Griffding in french, Griffpipp in Italian (I think it 
would be Griffgoof in english).
He looks like goofy very much, but he is a bit different (clothes, 
mind...), he seems to be a scientist.
So I wonder: could it be a cousin of Goofy? Mickey himself knows him and 
call him Griffding (or Griffgoof).
Could anyone tell me his opinion about the question? I have to know if I 
include him in my Goofy family tree or not.
Thank you very much!
Adrien