1 publication in US, 2 different US names for the character (story and title)?

[Goofy313g@aol.com]

I have a problem concerning a character for my tree:
D  6548 

in the title he is called Long-Duck Silver, and in the 1st page scanned in 
Inducks he is called Grabfaster "Grabby" McDuck...

Why this difference, and which name should I consider in my tree???
    

Gilles
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