I have corrected the filed names after clause "FROM" according my names so it should work like this:
SELECT Q1.Unique, 'ID' AS [Changed Field] FROM qryNewOld AS Q1 WHERE Nz(Q1.IDOLD,0) <> Nz(Q1.IDNEW,0)
but once I click run it asks me to enter parameter value so assuming "Q1.Unique" isn`t...