The problem will be, that with such treaties as TTIP, the worst of both systems will become the default.
So it is very likely, that the US will get the standards for air pollution (from automobiles) from the EU and the EU will get the food standards from the US.
Looks like the EU will only get the standards from the US:
"The US insisted on its request for the commission to “require” in its standardization request, CEN and CENELEC to involve US experts in its standards development process (with no guarantee of reciprocity) as a condition for referencing harmonized standards."
