The Marvel variant has No. 3 on both the cover and in the indicia. The Whitman variant states that this is issue "No. 3," but #1 is given on cover. The "No. 3" on both issues is probably an error because the contents of this issue (with a different cover) were published as Marvel Comics Super Special #3.
This issue is a variant of
Marvel Special Edition Featuring Close Encounters of the Third Kind (Marvel, 1978 series) #3 (1).