A:Answer No. The X8 is AC while the X10 is AD. They are two different bands.
The AC will most likely be the same as the X8, but you wont be able to use the AD band that the X10 offers until you have an adapter that can pick it up.
From what i heard, the AD band is good for short range data transfer. Meaning Wireless Streaming, Home Network Cloud, Gaming. Other than that, it's range is pretty poor.
If you want range and reliability, get an AC5300 or AC3100 router. Currently, Asus makes the best AC3100 and 5300 for those marks.