Amazon Fire TV w/ 4K & Alexa Voice Remote

Amazon Fire TV w/ 4K & Alexa Voice Remote

These have apparently been discontinued and replaced with the current Fire TV stick which is about 10$ more at the moment. Anyone know what the difference between them otherwise is? Would I be able to use something like the Steam Link App to play games from my computer on my TV in 4k? (with a 4k monitor on the computer as well, so no upconverting)