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From your photos, the right-side MID controls are identical (some resistors are flipped but that's unimportant). They swapped okay, correct?
Do you still have the 2017 controls, and if so, could you take a photo of the reverse side of the circuit boards? I'd like to work out the button-to-resistance mapping for the controls. If I can guess what the reverse side of your 2018 controls looks like (or better yet, if you could take pictures of those too), I should be able to figure out what exactly is different between the years.
This wouldn't help your goal of getting a working pause/play button on your '18 head unit, but can suggest what resistor changes can be made to otherwise use early buttons on a late head or vice/versa.
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