e-Newsletter Members List

I just installed the eNewsletter on my site. I would like to import subscribers from my previous newsletter plugin to the e-Newsletter.

I have a few questions I'd like to get answered before I do.

Question 1:
If I import newsletter subscribers will they become members of my site? I need to know before I do this because I am using a paid membership to my site with different levels.

Question 2:
If not, then will importing them now create duplicate subscriber entries in my newsletter database if they elect to become members? I don't want duplicate subscriptions.