Power Functions Plug Variants

I’m trying to determine if some second hand PF motors I’ve recently bought are genuine or not. All of the studs have ‘Lego’ on them, as well as the motors themselves, and they look identical. The only difference is in the plugs, and I appear to have two variants. They even have cast numbers and other genuine looking markings. I was wondering if anyone is aware of any differences in the plug design over the 12 years of manufacture, or from different factories. One type has the two holes on each side, but these in particular are solid. There are photos attached and hopefully someone will recognise them as genuine so I don’t need to have a little chat with the seller. Many thanks, Chris
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