What is the correct way to copy an object from one model to a similar model?

I have two models that are identical in structure except one has 2
extra fields. The second one is used for record keeping and is never
edited by users. The system takes the first model and copies it to the
second model, adding some extra meta information, all when a certain
action is performed against the first model.

What is the best practice for this?

spam.attribute_one = foo.attribute_one
spam.attribute_two = foo.attribute_two

Or, is there a pattern that works well?

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