Monster Life reactions

The notice that comes up when you combine says that rank and level are factors in determining the outcome, but does the type of both combining monsters factor in as well? Will I have a bigger chance of getting a S rank ghost if I combine 2 A+ rank ghosts together as opposed to A+ ghost and some other A+ monster?

Some ppl are saying it does matter on what type they are. I got my S mushroom that way (now I remembered that I went to that one farm that had just A+ mushrooms and fused there to get my first S mushroom).. :/