using index match to compare numbers on different sheets based on a common criteria

I have two different sheets with records of sales and I want to use index match to calculate the difference between the numbers on each sheet. I have a vlookup formula which sometimes works but has a few value errors so thought index match would work more efficiently.

Another part of the sheet also has to dates which it would be handy if differences could be identified. returning blank if the same or the date from the first list if different. This would obviously be a different formula to keep as simple as possible as the results will be in different columns

Could you show us what your expected outcome is?

Beth.

I have updated my sheet, but essentially i am looking at
5
10
11
-11

for the numbers formula and

blank
05-Jan
blank
14-Jan

for the dates