Willsenton r8 upgrade from original amp to upgraded, how do you tell the difference?

I'm thinking about purchasing a Willsenton R8. I was watching a youtube video on Skunkie Designs and she had done some mods on her amp that also made it safe to use. she had also said that Willsenton had incorporated her mods into production of the line, after watching her video. Now the question is since Willsenton has upgraded this amp and has not put a MK2 on the upgraded design, how can you tell if your amp is the upgraded version?