They are definitely not the same inside. The A20/A30 from AK is crappy, unsafe and unreliable. The Junsi P350 is safe, reliable and quiet and IMO excellent value. I have recommended them to many people and only know of two cases where there were problems and the units were replaced promptly under warranty.
I have one of the earliest Junsi P350 and have been running it several times a week, almost always at 300W or more total load from as long as they have been available (2 years - not sure, I lose track of time).