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Yes, they should both use the same DoFD.
Removal could have occured in one or two separate ways.
The CO could have been excluded by the CRA from your credit report based on nearing the credit report exclusion period, of the creditor could have reported deletion of that derog from their reporting.
What is the DOFD on the OC account?
If the CO was excluded by the CRA, then the collection would have the same exclusion date of no later than 7 years plus 180 days from the DOFD.
Thus, the collection would soon become excluded from all CRAs.
However, if removal occured as a result of reporting of a deletion to the CRA, that would not affect the contnued reporting of the collection or of any reporitng made to other CRAs.
If you have any old hard copy reports, check to see if the estimated removal dates were the same.