Twin boys meet and swap lives where ying yang necklaces

two boys who had different lives find eachother and find out they are twins. one goes to a boarding school and is beaten the other comes from a posh family.
They swap lives and have to prove to their parents that they are not who they think they are.

Rings a huge bell...can you give details as to how old the film is, more or less...foreign film or US?

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The tricky part with this is that it sounds like a retelling of The Prince and the Pauper, which has been retold many, many times.