The easiest way to do this is to do a full self join between the two tables on the Order ID.  Make sure you  strip both tables down to just OrderID and ProductID first, as this will return every combination of the other rows. This will also include matches with the same element, and flipped matches. IE You'll get rows that look like these

So the excess that you do not need will need to be trimmed away with formula columns. So make one custom column that is null if ProductID1 = ProductID2, and make another custom column that will concatenate ProductID1 and ProductID2 in order from smallest to largest, then filter that custom column by distinct. Let me know if you need additional help with the syntax of either of those formulas, but that should result in a table that looks exactly like what you are looking for.