Well, if you do look though the general shaping of the letters seems similar. Thing is, how much would her signature have changed in 6 years? Or did she just take great care in 1997, and less care in 2003?
Note the curvature and shapes on the 'A', and 'K' and the 'ma'. The way the 'y' smaller arm crosses over. They do look awfully similar, despite one being very extended.