The only difference between these two descriptions is whether the FAA implicitly understood that the MAX is NOT the same as the 737. If yes, then they were talked into accepting it anyway. If no, then they were tricked (unless Boeing genuinely believed that there was no difference, which is clearly false.)
The kind of people who work at the FAA jobs where those decision are made know enough about planes to realize that a different engine placement is not without effect. That alone means they should at least have done extensive testing internally, which they didn't since it was pretty much clear they used the older 737 simulators / didn't have 737 MAX simulators.
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