I had started a blog ehowportal.com recently,I was used to post my blog on blogspot platform but after setup my WordPress Blog I was in search of such a trick by which I would post my blog post on WordPress platform which feeds should be sent to all my older readers of blogspot blog.So after migrating from blogspot to WordPress I keep the blog brand name same but what about the feed readers,they must be same as before and whenever user will subscribe my older blogspot they will have my new blog feed instead of older one.
That can be possible when you are going to transfer your feeds between two account.The most useful tips when you are going to sell your blog or change blog ownership the feed transfer is necessary thing so that he another account has all things including feed subscribers and the new blog has not to be started with new feedburner account and all feed setup procedure.
To change your website feed, log in to your feedburner account and there will be options like Edit feed details, Delete feed, transfer feeds just below the feed of your website heading.
There Go to edit feed details and click on it, so you will get following type of details,there add the feed details of your new website feed.The feed address will be same just you need to add the new website feed at the original feed.So all the new post posted on your blog will be received by the feeds subscribers you have with your previous feed address.
Related : how to remove feed subscribers from Google feedburner account