It is for sure. I think I used the game changer .68 SB last time. I was on vacation and I was a rookie. I hated Nacets back then to and now they are in my top 5.Permasharps are one of those blades which work beautifully in some razors but also bite from shave 1 in others.
I stopped trying to figure it out, rather make the identification and move forward.
@Balin
Perhaps the razor you last used the blades in is different ?