Your old content is connected to its class via the class_id - a number (not the identifier string). Although it is possible to persuade your old data to be assigned to the new content class, by modifying class id values in the database tables, that process is not really one to be described in a quick answer here. Either manually modify the old content class (usually easy) or export your old person-content and import into the new class (probably more tricky).
The Web Application Service Provider
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