The ChipGuide is a good source of information but isn't complete and often raises more questions than it answers.

My questions remain:

1) Are these different casinos?

Seneca Allegany Casino
Seneca Gaming and Entertainment - Salamanca

(I believe that they are)

2)Do these casinos each have their own chip?

Seneca Gaming and Entertainment - Salamanca
Seneca Gaming and Entertainment - Irving

Thanks.