So I researched a bit on this and it seems like they are using same PCB. However the housing is different and the claimed range is different too (4500 sq. Feet vs 6000 on MW6). Also, this unit sells for cheaper than an MW6 in China during 1's day sale, so there's no way they use completely same hardware. If iball was able to make it this cheap, Tenda would also have been a lot cheaper at least in China.
My assumption is that the PCB and gigabit ports are the same, but they are using different WiFi hardware. Else the range and design would be the same.
Why not just get Tp link's mesh networks.
The E4 is selling for just 9k. The A6 is a really low end router which won't perform that well even with mesh since your backhaul will not be very high performance.
In networking, going for better firmware is very very important. I'm sure that TP link dedicated mesh routers will work way better with regards to handover and smart 2.4 and 5GHz selection.