[Porsche_911s]

Is there a difference in oil tanks? '74 vs '78

Are the '74 oil tanks stainless steal with copper necks? Is a '74 & '78 stock oil tank the same tank?

I am about to do some part swapping and wanted to double check. My '74 tank was cleaned and has been running and if the '78 tank is the same tank I am not going to switch it out.

Thanks,