Is Seas0nsPass specific to each ATV/iOS version?

Hello, i am currently lloking to buy an AppleTV 2 box. Since i plan to jailbreak it i’d like to know whether seas0nspass is specific to every atv/ios version and where i can find older seas0nspass versions for downloading or if i can safely use always the latest version for every atv/ios constellation.

Also i wonder if i can safely rely on the ios-version to get to know the installed atv-vertion? I mean, i found an offer with ios 6.0.1 installed. Can i be sure the atv version is 5.3 or may it be a different version too?