How wonderfully magnanimous of you.
Oh no… the logic you promised failed to appear! You are committing the fallacy of begging the question (circular reasoning). Your argument assumes in its premises the conclusion it is trying to prove. If I want an argument that proves that the OF and the EF confer the same amount of grace, then that conclusion cannot be a part of the evidence, which you are doing in premise 1. You assume, in premise 1, that “receive Grace” is the same as “receives the same amount of Grace.” There is absolutely no justification to that, unless one uses your conclusion as a premise. That, however, is the classic definition of begging the question. Since your argument contains a fatal logical fallacy, unfortunately, you haven’t proven anything, so please remove the QED.
It reveals much that you refer to argumentation as a “trick”
Again, your argument (trick?) fails. Notice that you say we are concerned with Grace, but then you list what is necessary for Mass. You cannot equivocate the two. If you are going to prove that Mass 1 confers the same Grace as Mass 2 by using properties, then you need to list the properties necessary for the conferral of equal Grace, not the properties necessary for Mass. Otherwise, if you list the necessities for Mass (as you attempted to do here), all you end up proving is that Mass 1 and Mass 2 are both Masses. No one is disputing that. You are proving something that is not in dispute (that both are Masses) and then saying that your proof actually means that both Masses confer the same Grace. You have begged the question again.
An example of the logical fallacy you just committed would be the following:
Object A is a plant known as lactuca sativa. It is a leafy vegetable. It is iceberg lettuce.
Object B is also a plant known as lactuca sativa. It is also a leafy vegetable. It is romaine lettuce.
Because Object A and Object B have the same properties (lactuca sativa, leafy vegetables), therefore Object A and Object B both confer the same amount of nutrients.
This is obviously false. The only thing that we can conclude from that list of properties is that Object A and Object B are both lettuce. Unfortunately iceberg lettuce and romaine lettuce are not equal in nutritional value; iceberg is quite deficient.
If you argue that Object A and Object B do not share the exact same properties because one property is nutritional value and Object B has more than Object A, then you are exactly right. However, if you are trying to prove that Object A and Object B have the same nutritional value, you cannot put in your list of properties that they have the same nutritional value, because then you are assuming what you are trying to prove, i.e. begging the question. If we were to apply this scenario the OF/EF Mass question at hand, you could not include in your list of properties of the Masses that they confer equal Grace and then have as a conclusion that they confer equal Grace. That, too, would be begging the question, which is exactly what you have done.
And just to be clear, too, I am saying that both are valid and licit and two forms of the same Roman Rite.