Nope. I've compared WZT vs MDSN. Install is the same. Everything's the same between the two. There's no color difference or flash screen as you're saying.
There is no difference, the installers the same, everything byte to byte is same except WZT leaked one had a identification tag and the MSDN doesn't. The identification tag is for M$ to know who internally leaked it. It will not interfere with the user experience AND ITS SAFE TO USE WZT LEAKED ISO'S.
Rock Hunter is right, i have both iso and didn't see ei.cfg in WZT version. Edit: actually they both got ei.cfg, i was wrong and missed it lol