The only way you can do this is to:
1) for each column create another column i.e. OldValueZipCode for each column you want to monitor
2) when created populate OldValue with the values that were entered in a flow
3) when modified flow (the one your talking about) use a combination of OldValue and then actual Value to display the email in the format you need
4) update OldValue with Current Value.
Not ideal but will achieve what you need. In other words no where is it recorded - the only other way may be to retrieve a older version from rest api and process that, but the approach above is probally simpler.