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New GEMB/Dillards account posted to my CR. My TU score went up from 719 to 725 and EQ score remained at 692. I wonder why TU liked it and EQ did not care for it.
Each CRA licenses its own, customized version of FICO scoring from Fair Isaac. They emphasize different things, based on the perspective of the CRA to which they market their product.
So even with identical credit reports at each CRA, scores routinely can vary by as much as 30 points.
The EQ FICO algorithm probalby hit you harder for the new inq, or did not give as much weight to the new CL.
I think it probably was the new inquiry required to get the new account. If that is the case, inquiries drop from any FICO scoring after 12 months.
But it may also have been a decrease in in your AAoA, scored differently under the FICO algorithm they use.
You will never know for sure, as any credit scoring algorithm is a tightly held trade secret. All we can do is speculate.