I'm not challenging the hypothesis, but statistically, you would need a larger sample size to make any sort of definitive conclusion, probably a minimum of 10 units, 10 directly from Innokin (remove the variable that a US reseller might also be selling 'copies') and 10 from Fasttech ...including opening them up and seeing if there are any differences on the inside.
We know, for a fact, that Innokin made changes to their MVP units in mid production (added eGo threading) sometime between "mid-2012" and current, without making a version change. That at least sets a precedence for un-announced changes to production parts and, therefore, has to be taken into account in the study.
My guess is, you would likely be hard-pressed to find any two devices exactly alike in every way, the chinese simply do not operate under the same production and quality control methods that are more common with US manufacturing (which contributes a great deal to why US products are typically more expensive).
Again, I'm not saying they aren't "fakes" or "copies" ...I'm just saying there's not enough information here based on exactly 1 sample to form a conclusion.