Executing a row based filter based on changing column names

I have a data set and workflow set up in a loop. The loop runs through two Excel sheets that do not have the same row count and column names. I want to filter out specific rows in each data set based on the column name for each iteration. I can’t seem to do that in the workflow because each result only shows me one iteration at a time. Is there a way to identify the column to perform the operation on by column position? Is there a way to designate the operation based on the two possible column names as options?