What are you even talking about? Why would he speak and act like a completely different character simply because both characters wear suits? It makes zero sense.

Like I honestly don’t even know what else to say. They’re two very different characters with the only similarity being the fact that they wear suits. They wouldn’t behave similarly in any way whatsoever.

Edit: for example, since you specifically mentioned it in your original comment… Why on earth would the Joker say anything in Kazakh?