No they are two different discs
The bonus CD was available if you pre-ordered BG2. Electronics Boutique may still have some, mine does, and I persuaded them to give me one when I bought a game.
The collectors CD is only available with the special Collector's Edition of BG2 which is out now.
The main benefits of both are an extra shopkeeper in the Copper Coronet and Adventures Mart respectively. Each has 10 high level magical weapons gleaned mainly from Torment and Icewind Dale.
If anyone has a copy of the collectors edition, please zip it to
mm666@hotmail.com as I can't buy it in Scotland. Thanks?