Yes, they worked for us, and we never suspected they could be the same person. During their working time, they worked at different times while our support agents tried not to overlap.
Basically, you can't really say for sure if both accounts on the bitcointalk forum are controlled by the same person or not? If you think back and recall the interactions you had with them, is it possible that they could be the same individual?
The evidence presented by forum members in this thread, linking the two accounts, appears to be indisputable. Do you have any evidence that contradicts this conclusion?