If you intend to stay within the range of data, use the two tests as equivalent.HOWEVER, there is a strong indication that if you were to exceed this range of data, that difference would become statistically significant. Within the range of data that you evaluated, this difference is not statistically significant and the two test method could be treated as equivalent. The slope between tests A and B is not equal to 1 and there is a bias between the two tests. Questions 1 & 2) If you take the results of the orthogonal regression, the Bland Altman Plot, the paired t-Test and the test for equal variances together, I would draw the following conclusion.
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