The salary change life event should not get detected if there is no change in salary amount

We have a requirement wherein we want the salary change life event to not detect when there is no change in salary amount just a record is created for salary change but the previous salary amount and current salary amount is same.

This is the formula that is currently configured in the system. We need to add the condition if Previous salary is equal to current salary then life event "Salary Change" should not trigger.

inputs are BEN_SAL_IN_SALARY_AMOUNT(text), BEN_SAL_IO_SALARY_AMOUNT(text), BEN_SAL_IN_DATE_TO(date), BEN_SAL_IO_DATE_TO(date), BEN_SAL_IN_DATE_FROM(date), BEN_SAL_IO_DATE_FROM(date)