The absolutely easiest way to tell the difference between L052 and L168 is to know the country where they were collected... L168 comes from Brazil, L52 from Colombia.
I think there's further reason for confusion: L168 is Dekeyseria brachyura, which is legal to import to Australia, L52 is not identified as that species, and thus not on that list of "legal to import", so the exporter/importer will have good reasons to not declare it as the correct species... So you're unlikely to get the correct name from the importer...
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Mats