A:AnswerYes you can, as long as both are connected to the same wifi network.
For me, it shows an option on my mobile youtube/ipad youtube as "shabbir's fire stick" selecting which I can cast videos to my TV.
A:AnswerYes, only difference as far as I know is that the 4K one will work with 4K where the other ones will not. I would recommend getting the 4K Firestick so if you get a 4K tv eventually than you will have the Firestick that is compatible
A:AnswerYes you can!!, this is an Android variant device all you have to do is download " downloader app" or side load google play store then download and install your heart content. There are tons of help on the web, start point can be Troypoint.com
A:AnswerYes , it works with any HD tv. In my opinion, the 4K stick made the picture a bit clearer as well on my 1080 tv . The power button is a great feature that the regular firestick does not have also.
A:AnswerU will get 4k quality on a 1080p if u can find a 4k program. They are very minimal in the tv programming worl right now unless u watch football.