Restoring Blog & Finding The Correct Database

I wanted to backup an existing WordPress installation and then restore it on another domain name that I own. I want to change the themes and different things to change the look to see if I like it and then if I find something I like better, then I will change it on the original blog. I’m afraid to make too many changes, especially theme wise on my current blog because I’m afraid of messing it up badly and not getting it back to where it was (my blog has been established since 2009 and has readers so it makes it hard to play around with the look without my readers wondering what’s going on). So I figured by using an extra domain that I’m not currently using, I could play around with it without it hurting anything. I hope this makes sense.

When I backed up the original blog (under Tools), it had

import, export and backup

as the options available. So I made a copy of the blog information using the export option and one using the backup option.

When I went to the new domain with a fresh installation of WordPress, it only had the options of import and export (under Tools),without the backup option. I had planned on using the backup file to restore it, otherwise if I don’t, it probably won’t look exactly like my current blog. I thought this had to do with WordPress but is it more to do with the theme installed and theme does not have the Backup option?

Does anybody know what I can do without the backup option so that I can still transfer my blog to the new domain and have it look like the original blog?

If I go through MyPHPadmin, how do I find out for sure which of the databases belongs to my new domain? When I click on MyPHPadmin and go to databases, it gives me a list of databases numbered wrdp1 through wrdp12. How do I find out which database goes to which website/blog? I’m worried that if I pick the wrong database to restore that it will erase the wrong website and install the files making the changes irreversible.

These are the names of the files that I have:

abc.wordpress.2012-09-08 – Export option – XML Document
abc_wrdp5_wp_20120908_055.sql – Backup option – SQL File

Sorry about the long post and thanks in advance for the help. It is much appreciated! If you have any questions I will reply ASAP.

Reg