At one point there were some pics on the net comparing the two. I don't recall where they were and it was a number of years ago.
Overall, when put side by side, all the Arcadeshop are for Tempest looked washed out and had much less vibrant colors than the Phoenix Arcade art. I think there are also some minor errors on the Arcadeshop CPOs and marquees.
Given the current alternatives (none), the Arcadeshop art it okay and certainly works.