If I understand it corectly, the specs which change are related to the hashrate. The power supplies would be the ones they told us about already (Murata or Emerson), so at the wall the units will have the same consumption. Good to plan and verify the electrical circuits you plan to install those babies. When they come, you just  plug them in, instead of swearing at the electrical connections.

The issue I'm seeing here is only to overcome temperature limitations in the various setups. So if we power the units 220-240V, from Emerson you get 1200W per power supply, while Murata can give you 1300W per power supply. Hoping that the units can use all the "juice" they get, a Murata powered equipment will give you more "juice" to draw on. If the hashing boards are the same (which will not be the case) .. one would expect  better output from a  Murata powered unit.

But everything should be averaged. Good chips and "bad" (corner cut, but within specs) chips are being used for the hashing machine, with good and "bad" power supplies. The word "bad' should read here as "spec threshold".

The only hope is that when put together, i don't get a box with everything at the limit A more power demanding board should get a good power supply to compensate. I say hope, because with everything in a rush , no one in his right mind will spend the time to optimize the boxes before shipping.  The focus should be to have them hashing and out the door. A good manufacturer with high volume has most of the things right, solving the issues as they appear (with RMAs at worst or firmware / configuration fixes at best).

In Canada you pay customs tax when you get them. Not sure how they'll calculate it in this case, versus a SP10, I guess by value In US you pay customs tax if they feel like it (if it exceeds a certain amount .. your carrier knows better). VAT is Value Added Tax and you pay it in US when you go to any store and buy hardware, how much, depends on the state you're in.