 if all of the following are true:
The model IDs are equal (or not present)
The response unit names and units are the same
The covariate names and units are the same and are in the same order
The specification names and values are the same
The predict_fn are the same
The predict_ranef are the same
The fixed_only slots are the same
The response definitions are the same
The covariate definitions are the same

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