Flow cannot determine if there is a change in a SharePoint column - it only knows there ihas been a change in that particular item/row of data. This really isn't a Flow issue, it is a SharePoint issue.
About the only way of determining if a column has changed is to store a copy of the data in a second column. If the two are not the same, then that column has changed. You'll need to kep the two columns in sync - after a column has changed update the "mirror" column.
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