Not really, considering Mario has had that costume from Melee (Also SSB64?), so it would make sense to have it. That, and Wario's costume is not his usual, but his WarioWare attire. It doesn't seem fishy that a character from the same series now has his very costume, his IDENTICAL Down + B, and a horribly similar neutral Special? Hmm?
The neutral B don't work the same. But how many chargeable moves are in Smash Bros.?
Samus and Mewtwo share one.
Luigi, Pikachu and Pichu too.
Jigglypuff and Sonic.
Marth and Roy.
Link and Young Link.
Sheik can charge needles.
DK can charge his punch.
Diddy can charge the peanut gun.
Dedede can charge the Jet Hammer.
etc, etc.
Many of these moves are very similar among them, just like some characters have identical A moves:
Mario and Falcon can both AAA
Both have a flip kick in the air.
Both kick to the side.
Both use their legs to sweep.
Falcon and Samus share the up tilt, how many characters share the sexy kick? The list is inmense.
Marth and Ike only share the counter, but the rest is awfully different. Is like comparing Pit with Link. Both have arrows and swords, but that's it.