No Difference except screen size of 2" & bigger or more powerful battery ... OS is EXCATLY the same 5 Tho soon to be 5.4 but then ALL of Gen 5 models are to get that update also. AND ALL the Same Ports.
Yes mine got the Update with the On Deck & Page Flip [Hate Both] Then what ever else that was in the update Kick started it into behaving

Turned OFF the On Deck it whipped ALL my Movies OFF the 10

thankfully putting them back on was not as bad as the 1st time. 15-20 mins adv per movie.
Since you asked me IF I owned it NO BUT my Neighbor does. I helped him get set up... giving me a Real Life chance to see if I wanted the 8". YES if I didn't have the 10....
So Do you have the 8" ??? Last I heard you say in another thread you only had the 1st Fire...