The top one looks like the Commodore PC keyboard (sold with PC-10 to PC-40):
It feels like rubber dome, but I popped a key to check. (it was on there so tight, I thought I'd break it)
Surprisingly, it's Mitsumi, just like most Commodore & Amiga keyboards. But the Commodore & Amiga keyboards don't feel as lousy as this keyboard does. This has to be the worst Commodore keyboard I've ever tried. I wonder why. The construction might be different. It looks like a pain in the ass to completely disassemble it, but I briefly opened it.
Yep, it's Mitsumi. The backplate is curved unlike the Amiga keyboards.
It really does feel like a lousy rubber dome keyboard. I suggest anybody considering buying this keyboard
not to get it.