Well, now that you said that, I hear a lot of similarity too (it's strange I didn't notice it myself, 'cause DIABOLOS is one of my favorites from DSS).
Btw, I think most of you've noticed it by now, but the cover of their new EP is the second half of CUNNING KILLER's cover. This is how they look like together:
(Sorry for the different text colors, couldn't find a better quality of CUNNING KILLER.)
I don't really understand why did they use a mini-album AND a live limited(!) single for this though.