No two signatures I've ever written actually look the same. I do wonder how this might affect people like me!
I was stopped temporarily last night at the polls after the poll worker scanned my ID and had me sign. She said they're not the same signature, and I'm like, "lmao, yeah, no, no they're not. I gave up on my signature a long time ago."
You could start signing with an "X" and that first X would have legal force. Might confuse or annoy some bureaucrats though.