Yes it,s TX1 like the one in Shield TV 2017 100%, the only question is if there has been some minor updates in the SoC from the Shield TV 2015 SoC, Antutu benchmark is a little higher on Shield 2017 but CPU and GPU scores are a bit lower (I'm guessing they lowered clocks to better fit thermals) but UX scores almost doubled, but I dont really know what could made that change.
I,ll try to update with youtube links later.
Funny how some people jumped at my posts pointing towards something at the very least really close to TX1,yet here we are.