The images below show a difference in rendering page 1 of the same PDF file. The command line used in each case was

gswin32c -dNOPAUSE -dBATCH -sDEVICE=png16m -sOutputFile=pg1.png -dFirstPage=1 -dLastPage=1 -=r72 sample.pdf

The source PDF contains a form field which was filled and "flattened" using ActivePDF Toolkit. As you can see, the text in the form field (which was supposed to be "Prepared For Michael J. Lambert / Parts Plus") rendered incorrectly with Aladdin GS 8.13 but correctly with Aladdin GS 7.06.

Rendered with Aladdin GS 8.13
Rendered with GNU GS 7.06