They're both comedy jobbers but Santino is a much better character in just about every way. It's not as one dimensional, it's pulled off better, and because he's pretty good in the ring, if they want to make him a threat to anyone, it's believable.
I think it takes one hell of a great performer to do what Santino does. The comedy jobber is like an offensive lineman. His job doesn't get as much press as the QB, it's not as praised, it's not as studied, no one dreams of growing up to be like that, and it's underrated by pretty much everyone.
He definately is just that, a comedy jobber. Hes not going anywhere wih his career just like Eugene and they both have some unique accomplishments under their belts (tag titles, Milan Miracle, winning kurt's gold medals). I dont think theres anyone better on the roster to replace him. With his attire and his size I think its hard for fans to take him seriously as a competitor, which makes him the perfect candidate for the comedy jobber role.
If by that you mean material fake accomplishments like winning a world title, probably not. However, if by accomplishments you mean a raise for the actual person and a steady paycheck, then you're wrong. I've said this before, but if you told me "you can be Daniel Bryan or Santino" I'd feel more comfortable with my job if I were Santino. He's not as expendable, and this is coming from a guy who's driven 13 hours round trip to see Bryan Danielson in ROH.
Santino is amazing at his job, maybe the best comedy jobber of all time because he's so versitile and cracks me up pretty much every time. It's ridiculous how good he is at his job. Considering most guys would scoff at the character, do a shitty job, bitch about not being "used properly". Santino can GO in the ring. He's good, some might say he's being under-utilized, but if your show doesnt' have variety, it's pretty boring. Not everyone can be a badass.