puoi usare il costrutto eccetto per trovare una corrispondenza tra le due query.
select * from (select * from query1) as query1
except
select * from (select * from query2) as query2
MODIFICA:
Quindi invertire la query per trovare le differenze con query2 come driver:
select * from (select * from query2) as query2
except
select * from (select * from query1) as query1