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Hey there! Tawny from Moz's help team here! I think I can help explain. The big difference between these two blogs is how much link data we have for them in our Mozscape Index. Page Authority (PA) is a score developed by Moz that predicts how well a specific page will rank on search engine result pages (SERP). Page Authority scores range from one to 100, with higher scores corresponding to a greater ability to rank. Page Authority is based on data from the Mozscape web index and includes link counts, MozRank, MozTrust, and dozens of other factors. Like Domain Authority, it uses a machine learning model to identify the algorithm that best correlates with rankings across the thousands of SERPs that we predict against, then produces Page Authority scores using that specific calculation. In the screenshots you included above, it looks like one blog has all 0s for their MozRank, MozTrust, links to that page, etc., while the other had more significant numbers. I think that helps account for why that site has a higher Page Authority. I hope that helps! If you've still got questions, feel free to drop us a line at help@moz.com.