Based on the descriptions in the parts catalog, they are tinted with a slight green hue. This is very common though and has been for decades. My 65 Mustang had "Tinted" windows from the factory (green and barely noticeable). As for differences between the windows... The sources of the windows are all different so that might come into play. I would be hard pressed to believe many folks could tell the difference between them though.
From the descriptions in the parts catalog
Front Windshield Glass Set (Green)(Fuyao)
Left Front Door Glass Assembly (Green)(Pilkington)
Left Rear Door Glass Assembly (Green)(Agc)
Left Quarter Windshield Glass Assembly (Green)(Fuyao)
Right Front Door Glass Assembly (Green)(Pilkington)
Right Rear Door Glass Assembly (Green)(Agc)
Right Quarter Windshield Glass Assembly (Green)(Fuyao)
Rear Windshield Glass Set (Green)(Nippon Itaglass)
From the descriptions in the parts catalog
Front Windshield Glass Set (Green)(Fuyao)
Left Front Door Glass Assembly (Green)(Pilkington)
Left Rear Door Glass Assembly (Green)(Agc)
Left Quarter Windshield Glass Assembly (Green)(Fuyao)
Right Front Door Glass Assembly (Green)(Pilkington)
Right Rear Door Glass Assembly (Green)(Agc)
Right Quarter Windshield Glass Assembly (Green)(Fuyao)
Rear Windshield Glass Set (Green)(Nippon Itaglass)