Zenfone 2 US/Japan Compatibility

Hi guys,
(I tried searching this and so far no answers)

I want to buy an unlocked Zenfone 2 ZE551ML.

In the US, the price is nice at 9 (for the 64GB). In Japan it's over 0 (OK, with the exchange rate it's a little less, but...).
(Sorry, the site is preventing me from including external links)
http colon //goo dot gl/ss7hV8


The problem I am having is finding out if it's truly compatible with Japanese and US carriers. I would like to take this thing back and forth.

The frequencies look right, but on all the AusTek documentation is says (JP Version) near the 4G FDD-LTE frequencies. Do the major carriers in Japan use some variant of FDD-LTE that is different from the US? Or is this only a marketing strategy?

The only difference I have seen in the past on Japanese phones is that here they always come with a TV Antennae built in for Digital Japanese TV and the freakin' Carrier charges a monthly fee for the TV app! Haha

Here's the information from Asus Japan (open it in Chrome and it will translate the Japanese for you, albeit badly):
http colon //goo dot gl/3zo5E3

Decent worldwide Frequency list:
http colon //goo dot gl/EuOKoy

Anyone try this out between the US and Japan?

Thanks in advance.