If you see this, your blog is publishing on Blog*Spot.
If you see this, your blog is published on your custom domain. If you're not seeing this yet, then go back and review the instructions.
If you don't see either, and your blog is not "xxxxxxx.blogspot.com", then you're publishing to an external server, by FTP.
You only have 3 possibilities. If it's not one of the above three, maybe you don't have a Blogger blog.
Other than these details, which in reality simply involves the blog published URL, you won't find a lot of differences. A custom domain blog is simply a Blogger blog, published to a non BlogSpot URL.