Maybe the "2" after the date numbers and before the last 4 digits ? (or two digits on Austin's) .. I'm only grasping at straws though - it might be something only Spesh can identify purely on how they have them logged and which ones they know had the 2.2 upgrades.
or 2.2 is just marketing
my last broken motor was E0168-100200622-2-5130 I was told it had a upgraded one ? let's see what I will get for a new one
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So from @congerball's reply in the other thread, his was a 31st August 2020 motor and is 2.2 Spec . So maybe yours as a June Motor was a 2.1.5 spec with the first slightly larger belt, not the American Waistline belt.