Well the difference is the formulation of the oil. You quoted M1 & M1. To this I would have no objection. Chemistry between the two will be the same or close, as I understand it. M1 and Valvoline are different oils, different chemistry. One may, (for lack of better terms) omit the properties of the other.
Kind of like going on a semi low carb diet, not much results. Go no carb and you will lose 30 lbs in 30 days.
I am not a scientist, just putting in my opinion on the subject of blending two different formulations of oils.
@jetman asked for opinions. If I were going to try this, I would at the least use a Valvoline product with the Restore. As a matter of fact, I thought about it since it came out on my RV.