Ideally, and according to the manuals, rockers should be kept in their original positions. However, when parts must be replaced, there's no way to avoid mismatching the parts.
I would say as long as there aren't deep grooves or divots worn into the surface, it should be ok. Deep groove is one that catches your fingernail.
I have mixed used cams, rockers, and lifters from different engines and never had a problem. As long as there are no abnormal wear patterns mating, you should be good.
Noticed one or two rockers in the ebay listing, and your engine, have the rocker pad worn to one side. If you can match that to the lobe causing that, you may be better off. Seems to be a common wear pattern in this engine. It depends on the wear pattern seen on your replacement cam. edit: Just remembered, you're getting one new cam? If so, I think would choose a rocker with even wear on the pad. Are all those rockers the same size/shape, or are there differences like left/right, intake/exhaust?
Don't get the cams mixed up, that makes a huge headache.
Last edited by Spockster; 02-01-2020 at 02:20 PM.
Reason: new cam