Daffy Duck and Sylvester the Cat are the same voice - Daffy’s was sped up.

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It is well known that Mel Blanc used tape speed manipulation for his voices, such as Tweety, Porky, and of course, Daffy. Many do not realize that Daffy and Sylvester were the same though! I have four samples below. Two are original clips from Looney Tunes while the other two are sped up/slowed down. Enjoy!

Stephen Roessner