How do I compare two glob values in Oracle

select key, glob_value source_table
minus
select key, glob_value target_table

dbms_lob.compare(
lob_1    IN BLOB,
lob_2    IN BLOB,
amount   IN INTEGER := 18446744073709551615,
offset_1 IN INTEGER := 1,
offset_2 IN INTEGER := 1)
RETURN INTEGER;

Select key, glob_value
From source_table Left Join target_table
  On source_table.key = target_table.key
Where target_table.glob_value is Null
  Or dbms_lob.compare(source_table.glob_value, target_table.glob_value) <> 0

select key, to_hash_str_val(glob_value) from source_table
minus
select key, to_hash_str_val(glob_value) from target_table