A cartridge fork has a damper rod. The "cartridge" is just a piston valve with shims. For forks they generally either come in an open bath design where the bath oil is also the damper oil. Or they can come in a closed chamber design that separates the two. Your fork would be the open bath variety more than likely.

No big if you don't know the part numbers. As long as you're happy with what you have then that's all that matters.

On a separate note, the nsr uses 41mm forks. I imagine it wouldn't be too difficult to grab a cart from a newer 41mm fork and slap it in the nsr without much work. Just need to make sure the forks you take the cart from are as long or longer than the nsr forks. Most forks also use a 8mm bottom bolt so that isn't an issue.