Excel Power Query - Match one column but not the other

In Excel Power Query I am trying to match two tables where one column should match (i.e. GUID), but the other shouldn't (i.e. Value) so that I end up with only the different values from the join/merge.

So the equivalent in SQL would be this:

Please Login or Register  to view this content.

Is this possible at all or will I need to use some kind of INDEX MATCH or VBA code to achieve this?

Attached you will find an example file with the result (green header) that I expect.

Fast answers need visual help. Please read the yellow banner at the top of this page on how to attach a file.

Just do a join on GUID, add a column to return true if the values match, false otherwise then filter out the true values.