Even if it was not a perfect match, it did not matter too much since it was difficult to replicate the same signature exactly every single time.
Various factors like age, mental state and writing instrument could cause the signatures to vary.
What mattered most about it would be the consistency of the signature in its style, along with the unique characteristics and strokes that could stand out more.
If there was one thing she learned from drawing out the various inscriptions and formations, then it was that she needed to get used to repeating the process many times, going through trial and error, before she could get an acceptable outcome.
As more time passed, repeating that process, the more natural it became as everything started to become a little more consistent.
