rn1112
Are the free Mocks 1 & 2 comparable, in difficulty levels, to the other OG mocks?
They are comparable in difficulty level, but they are not the same as the other practice tests. In particular, the Sentence Correction questions in the first two official practice tests tend to be more formulaic that the SC questions in the later tests.
So, if you find more formulaic SC questions easier, you may find the first two tests easier, and in general, you may find some of the official tests easier than others, depending where your strengths lie.
Also, many of the GMAT concepts taught in courses and discussed on forums come from the two free tests. So, people who learn those often discussed concepts may find the first two practice tests easier than the others because they learned more that's relevant to the first two tests.
Long story short, the first two tests are not objectively easier, but depending on where your strengths lie and on what you have learned for the GMAT, you may find them easier, or you may find some of the other official practice tests easier.