It likely wasn't the same actors, the actors were local to Seattle, and SSG worked through Ubisoft on WBC.
The voice direction in WBC and WBC2 was so over the top, that any good actor is able to mimic that type of voicework. Voice actors LOVE being told to go over-the-top by the way, most of them are just one Safeway commercial away from a nervous breakdown.
- Servo