First app, couple of Qs

Hi,
Just had a couple of questions re App store.

If you cancel or fail to to pay your yearly developer enrolment,
and your app is removed from the store,
is it still available to the customers who
downloaded it while it was in the store?

also,
What is the minimum change to a project that
has to be made to get a distribution and debug
version of the same app installed to the same phone?
Is it just the project name?
Thanks, Art.

Thanks