Rickinator,
Sorry for the late reply, I have to assume the two saxes you are looking at are ATS 73PQ and an ATS 73P. Amati uses the letter suffixes after the model number to designate the different finishes used.
P should designate a Nickel Silver Neck and Bell and Brass Body with clear lacquer
PQ Looking at the wwbw picture, the bell looks quite a bit darker, but I do not know the details
Finish choices are avaible on all saxaphone lines in most cases.
Below are pages from Amati's catalog with different finishes.
http://amati.ecbook.cz/
http://www.amati.cz/produkty/series-73-tenor-saxophones/ english
http://www.amati.cz/produkty/tenor-saxofony/ czech
The only differences on the two saxes you are looking at are the finishes, but we all know that can make a world of difference to some SOTW members.
Regards
Dennis