Afternoon,

I've obtained two signed copies of a Rosa Parks book, one of which I sold last year which was inscribed, and I currently have another one signed with the same date of 12/1/93.  When comparing the two, there are definite differences, although a PSA QuickOpinion on the one without any inscription resulted as "likely genuine". 

Was Rosa known to deviate in some ways with her graph in the same day of signing?