In order to compare the data daily, you should copy the data somewhere.
The basic alternative is to do it manually.
Another alternative is to use Google Apps Script to create a time-driven trigger to call a script that makes the copy of the data.
Once the data of two o more days is stored on the spreadsheet you could use conditional format to compare. ...
How to know if Google Sheets IMPORTDATA, IMPORTFEED, IMPORTHTML or IMPORTXML functions are able to get data from a ...