From the PDF Introduction
A Web Enhancement for the FORGOTTEN REALMS Player's Guide to Faerûn Accessory
Conversion of the monsters presented in the FORGOTTEN REALMS Campaign Setting and Monstrous Companion: Monsters of Faerûn is fairly straightforward. This appendix summarizes the changes to monster skills and feats, damage reduction, type and subtype, and other information required to bring all of the monsters presented in those two books up to date with the latest version of the core rulebooks.
The statistics given here indicate the changes to existing statistics required to update the creatures to v.3.5. They are not full statistics blocks. Each entry provides the following revised information about each monster.