BLOB, CLOB, NCLOB, and XMLTYPE are now supported in Database>Compare>Data, as long as you have the EXECUTE privilege on the DBMS_CRYPTO package. This will only work on 10g and newer, because DBMS_CRYPTO didn’t exist before that.
If your table has BLOBs, you can only sync from the data compare window. You cannot create a sync script. CLOB, NCLOB, and XMLTYPE will sync with either technique.