All-in-one-migration

I just took over a WP site that uses EC2. I am trying to create a new instance using Wordpress By Bitnami to make it easier to handle files for people who don't know AWS. I am trying to test this on my own account before I do it for my company. I create the new WP and import the old one. However, it signs me out and asks for admin logins. I know the logins are the same as that for the current WP. My question is, if I log in to this new WP with the Bitnami instance, will I completely delete the previous site. I have not changed the A record so the test site is still just an IP address. I just don't want to login, find out it did not import correctly, and lose everything that's on the current up and running site.