Non-matching signatures.
Interesting that there are several similarities (general shape of first and last Ss; "To"; use of tail of the Y as the stem of the D).
But overall sig is different hand. Jan 10 is much more swooping and slopes to the right. Jan 30 is much more restrained. Shape of several letters is totally different (y, l).
I wonder how often she actually signed her name as "Stormy Daniels" before attaining notoriety from story with POTUS. If you are signing your name more frequently, you would presumably have settled into a specific signature. If you are used to signing Stephanie Clifford and are just getting used to starting to sign with your stage name, I could see where your stage name signature might vary a bit at first. Although to me the Jan 10 signature looks like a later, more confident iteration than the Jan 30 signature.