I have a worksheet with two columns that I need to compare data between. I
need to see what is different between one column and the next. There are
number and letter values in the column and about 180+ rows. The information
is scattered throughout the cells so there is no way to filter and check row
by row.

The columns look like this:

July April
MP123456789 MP555555559
MP987654321 MP666 H1258
MP789456123 MP00000 H89
MP987123654 MP123456789

I need something that would tell me that all of the above values are unique
between the two columns except for MP123456789