US No. 70 Vs 78 Shade.

Good day all, I know shades and color are subjective on there own.
even more so from a pictures or on a screen. I did take a few I had to put
together with proofs to show the differences. maybe this can help. the middle stamp is what im hoping to identify. I think its 78b, it seems to have no grill and no thins
centering is decent and perfs look ok.
and all feedback would be much appreciated.
I added two shade charts. Just for reference.

I have this stamp, but what color is it, it looks like a 70c, and have thick is thin paper.