Hello Chester_Tan,
maybe it’s helpful to compare both seat moldings.
The most important difference seems to be the height of the four “noses” around and before the saddle bolt hole.
At the standard molding the width of the “noses” is ~ 48,5 mm.
At the QR seat molding the “noses” are smaller, ~ 44,5 mm.
(The width of the grooves for the saddle rails is equal at both moldings, ~ 38,5 mm).
So, I believe that’s much more easy to “snap” a saddle onto the QRS than on the standard molding.
The crucial factor whether a saddle fits on the molding or not is the distance of the saddle rails to the the lower edge of the saddle nose, as you can see below.
Both shown saddles, the SDG Ti Fly and the Tioga D-Spyder (on top) will definitely not fit on the Strida seat moldings 
You might estimate the required distance at the original Strida saddle and molding.