I am wondering if anyone knows if the chain tensioner that came on the 2004 Hardrock SS is just a knockoff of the original Surly tensioner?

From pix of the original Surly tensioner, they look the same. I am wondering cause the new Surly's pulley has a better designed cage on the pulley. And if they are the same, then I could just order the new pulley rather than the whole tensioner.