Yes - they are simply different models of the same device.
Fire
no cause the kindle is a kindle fire and water will put the fare out
To get books on your kindle or kindle fire, hook it up to the internet and buy the books on-line. Wait for them to download then enjoy.
yes
No
Yes. Except on Kindle Fire
Download the Amazon Kindle app from Google Play, then login with the account you used on your kindle fire. The books should be located in "Archived".
Kindle fire, it offers the same, if not more than the iPod (Touch) 4
Yes it is but there is a kindle just for reading books but the tablet can do more than books.
Yes, you can listen to audio books on the Kindle and listen to music on it.
It means that you import all the books you have on your old kindle.
A Kindle Fire can do far more; it has a full web browser, a color LCD display, thousands of apps and games, even more videos and TV shows, and more. The Kindle Touch is a touchscreen eReader with a very basic browser (bookmarks, cookies, and history) with an eInk display. Basically, the Kindle Fire can do a lot more, but the Kindle Touch is a way better eReader.