Em, We also bought the TSA locks for our upcoming international flight and cruise. Please go to the website: www.TSA.gov for the answer about these locks. Although they don't specifically mention overseas travel I believe that is implied. I don't know about the cable ties.
I hope this will be helpful.
A little off subject, but I bought two TSA travel locks for our checked suitcases on a recent cruise. Only one suitcase still had it on when luggage was delivered to our cruise ship room.---never did find out why we were missing one.