Jason, correct me if Im wrong...One shouldnt really be using a product unless they know of its capabilites. Im fairly confidant in knowing what 80 provides to me, adding "a little" to it can bring amazing results. Im also fairly familiar with what VM can accomplish. The abrasives in VM are obviously no match for the abrasive in 80, therefore are of little if any value. However, VM polishing oils are of great consequence, to me, when using a product, as #80. They allow me to gain additional time to work with number 80, reaping complete benefits from its diminishing qualities.
Im not talking about mixing product here, but as the question implied, is it ok to use one pad for different products.
What I do is lightly season the pad with VM, then use the #80 in my normal fashion. I will occasionally add a drop at 12, 3, 6, and 9 o'clock positions to reseason according to my needs.
This method may not be for everyone, but one I find of value to me.
Vanilla Moose to #80 is what Hersheys syrup is to Vanilla Ice Cream !