After emailing info@ehx.com, they replied with this;
“
Hello,
The picture on the bottom was an earlier version of the pedal.
The design difference as far as the knob was simply a matter of easier sourcing of materials, and an updated design. The Made in USA was strictly a design choice.
Otherwise, it is the exact same pedal.
Best,
Chip
Cheers EHX.
* See differences. Top picture is mine and the bottom is another one with different black knob/info at bottom where made.