.020'' wear on 1984 190e camshaft lobe

[jlc]

Hi all. Great forum and many excellent contributors. Thanks to everyone.

So I am changing a head gasket on my friends 190 and of course AFTER I take the head to the shop to be checked and for new valve guides I notice that there is some wear (.020 by my measurement) on the #2 intake lobe. Everything else looks good to go.

My questions are :
1) Will a used cam and rocker assemblies from a 85-93 2.3 work?
I noticed that the sellers online make the distinction for the '84 cam from the rest.
2) If yes, should I use the original chain sprocket or get the one from the donor car?
3) Is this enough wear to worry about?
BTW, the engine # is 102 961 12 036 508.

Thanks in advance for your help.