Keep in mind that engine plants ran on a CALENDER year.
And assembly plants ran on a MODEL year.
It is perfectly normal for a jeep to have a previous year engine, in fact half of them do.
The manufacturer changes to a new model year in around July and
the engine plant is still using the real calendar until DEC 31st.
If you have your original doors, there is 'MDH' assembly date located in the drivers door.
That date should be closer to your Engine ID date.
I'd say no more than a week apart.
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