Thank you for clarifying, I found a lot of discussions if those two blades are the same but none had a definite conclusion.
I've used both Polsilver SI and the blue Wizamet. I cant tell them apart in my razors.
Depending on the razor(s) you're using, the Blue Diamond Titanium is a very good alternative for Polsilver. In my NEW SC, I couldnt tell a Polsilver from a Blue Diamond Titanium. In my Fatip Grande I can and much prefer Polsilver.
Super-Max Super Blue Diamond TITANIUM - https://connaughtshaving.com/supert.html