Is there a standard to evaluate the difficulty of a match up?

[EvermoreCR]

I'm new, and I just got a pretty simple question to make.
Is there a percentage calc standard to evaluate whether a match between to characters ends up being evaluated as low diff or high diff?
I want to know how that system works.

 

[KLOL506]

1. Compare their AP

2. Compare their hax

3. Compare their Resistances

4. Compare their combat skill

5. Decide on which dude is more willing to open with their hax

All these factors determine how hard or easy a matchup will be.