You probably won't be too happy with the short or the long answer.
In short, you can't compare tests from two different providers because they use two different algorithms.
The longer answer is that on the test the score has no correlation with the number of correct or incorrect answers. The only pattern and correlation that exists is centered around the number of hard questions answered correctly.
What complicates the scoring even more is the concept of experimental questions the dinner account towards the scoring but then again different test providers have a different idea about the experimental questions and many are almost all not really tell you if they have an experimental questions or how they use them or which of the questions that you were presented with, were experimental.
In conclusion you can't just take the number of Ridarenc and compare them across the board because the difficulty of those questions matter and the position within the test also matters. If you want to learn more about it you can search for Gmat algorithm and GMAT prep what if scenarios on the forum.
PS. What I find odd is the huge difference in your final score. Did you take these tests close together?
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