The VIN number should help. It's VIN plate is on the inner wing on the drivers side, chassis number is stamped on the bulkhead, possibly under the rubber seal that sits between bulkhead and bonnet.
This might help decode it & give your engine code/type;
Volkswagen VIN Decoder / VW VIN Decoder
Failing that take a photo of the engine & post it here someone should be able to identify it.
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