Looks to me like roller needle bearings.
Way more precise than bushings. Transmit more road shock and you gotta stay on top of greasing them, but they'll hold that long swingarm in line pretty solidly.
I don't see any zerks on the new arm. Greasing them is gunna be a lot more ctitical than it was with the soft stock bushings.
I'm assuming that it was designed to accept stock inner sleeves. If not, you got a problem unless they came with it.
The stockers are hardened, though maybe not to roller bearing hardness. If they were properly greased they may only be polished, rather than worn. I'd mic the middle, unworn portion and do a comparison. If they're within a few thousandths I'd reuse them.