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hey how are you doing? Are the sites on the same server, if so you can just do some dirty code that compares the database and does comparative updates, you might want to check sum the data you are comparing to make it a quicker process.
You also may need a table that links id to each other in the other table so you know what record to update, this can be done with a linking table or a submission checksum and a current checksum.
If the submission checksum doesn't exist then you submit it to the other database.
Otherwise if you are on separate service for hosting, then you will have to use
X-Soap
