I actually did assume it. Not in the tense I put it in. Once I realized/found out that they were passive adapters that means that all the switching of protocols is done in the controller of the object being used. For all of my devices so far, that would be a terrible optical mouse of some kind over the years which is why I have so many green thingys everywhere.
In fact, I never had any reason to think that they wouldn't be the same. Now that I'm actively thinking about it I'm reminded of a trick where people would want computers (IIRC servers of some kind) to boot without a keyboard because they were unneeded in that case. There was no BIOS option for 'no keyboard error off' or whatever, so some guy just stuck in a green USB to PS/2 thing, and they booted without triggering the error, so it was registering that something was there. Although I didn't think of this until just now, but it's possible that it was adding itself to other things subconsciously.
So with them just being passive basically shape plugs so the wires get to and can fit in the correct places, there is no adapting going on at all. It would be incredibly stupid, and in fact more difficult, to make them anything but the same thing. It was mentioned somewhere that there are some current USB keyboards that have on their controller the ability to go PS/2 but they don't include purple shape plugs. When I read this my very first thought was that I couldn't care less if they did, because I have 5+ green ones and I'd just use one of those if I got such a keyboard. No pondering or thinking about it at the time, just a surety that it would work. I didn't find the idea strange at all.
Then again, I have been accused of clairvoyance/ESP in the past...
So what about my active adapter? The wiki more or less just talks about the blue cube and that one belkin adapter that shares the same chipset.