Head gasket question

Well that went bust. The seller that made me the offer of $30 when their original price was $40 now "can't find" the HG that started me asking...
I bought a matching one from another seller,
I'll have to hit up RA for $18 "clearance" for the other one... Hopefully the other stuff I've been wanting to get from RA can be had from the same shipping point.
I have a regular 318 head gasket here (not "marine") since I'm not getting much action /replies on them when that one gets here I guess I'll put them up against each other and see if I can see a difference.