I can,t tell from the pictures, but if it was my head Id suggest taking it to a local machine shop and having them look at both heads and mill off whats required on one or both , after he makes a close detailed inspection, minor scratches tend to get filled with the COPPER-COAT spray when the heads are installed with the copper gaskets, but ,because I can,t see the true depth Id strongly suggest having a MACHINE SHOP that does head work at least inspect them and most likely take a minimal cut on the larger chamber size head to make it match the smaller