How to compare fields value with old fields value

I am trying to make a search that will compare the fields value with the old fields value to determine if there is any change in the value over time or if there is a new field added. For example, say I have 5 fields | fields _time Location Band CellID CellName. I want to run this search and compare the these 5 fields data with a week old data of same fields. Say, Week 1 these fields show values as : **_time Location Band CellID CellName 2019-10-10 California 700 123 CELL123456-700-1** Now I want to see if the last week the values were the same or different for same fields. Please help me to build the logic. Thanks in advance.