Gene Wilder's signature seems to vary all over the place. I will look to load some in person items I got off him but cannot get these for a few days. The ones you have do look fairly close. He used to use a secretary but seems to sign some of his own and there seems to be a lot more of his signed items around these days. I have had a good look and feel yours are the real deal but welcome other opinions.
I got him last year but mine looks different. On all authentic examples I have seen the "l" is cursive and connects with the "d". Yours doesn't but it still looks close to mine so I don't know.