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As far as I'm aware there is only the one download of NOOBS - not one for each version of the PI.
Usual advice is to always use the latest version of NOOBS (currently Ver 2.4.2). It can be obtained from here
As the NOOBS image is not just an OS (there is an installer and other OS options), I see no issue with having other software on the card. To run it you'd have to point the PI to it to execute code as far as I'm aware.
As for the rest of the question (and to clarify / correct my answer) - I hand you over to more qualified colleagues.