Yes. You get payouts through Steemit, but once it's posted here, it belongs to Steemit. However, you can keep editing your Steemit post all the way up until you receive the full payout from it. I also have to agree with @dolphinschool that Kindle publishing is pretty worthless, especially if you're a new author. 

I've never seen anyone succeed at self-publishing on Kindle unless they were already an established author with thousands of subscribers/readers FIRST. 

New authors drown in Kindle like quicksand. Just keep refreshing the "new releases" page of the kindle ebooks store on Amazon, and you'll see what I mean. Last time I checked, it was almost a whole page of new books every second that I refreshed. 

AND self-published ebooks on Kindle have gotten a REALLY bad reputation now because it's so easy to do it that everyone IS! Most of these new authors haven't gotten anyone else to even read or critique their book besides their parents. In the traditional publishing world, it takes years to release a book for a very good reason: the book has to be really good first. It's supposed to go through multiple editors and be tested among readers from different genres to see where it fits. In the future, traditional publishing will become more important because these are the gatekeepers sifting through crap to find quality stuff.

 No one wants to preview 100 self-published ebooks for free on Kindle and hope they find one good one. The average reader doesn't have patience for that anymore. They want a book from a trustworthy source (like a publishing house) that they know they're likely to enjoy reading. A lot of reviews on Amazon are fake these days too, and some bad marketers buy their reviews under the table -- so now, even the social aspect of Amazon is suffering.

Beware and choose wisely when self-publishing. I personally do not support anyone to self-publish on Amazon because it greatly devalues the work of their authors.      

Good luck!