CGA3 head gasket query.

I'm currently in discussion (read argument) with a company supplying my head gasket. They say the cg10/13 head gasket is the correct fitment for my cga3 as well but I'm under the impression they aren't. However they've just sent a cg10/13 one for me to try and I think they have proved me wrong, it measures identical to my old cga3 hg. Can anyone confirm the head gaskets are indeed the same? (Or has the old owner had the wrong hg) Obviously I know bores are different by the gasket rings are always oversized anyhow so I'm now doubting myself.
 
Essentially the same with the exception of the cooling channels located close in between the bores. On the CG10/CG13 head they're circular, while they're triangular on the CGA3 heads. Many people have used combinations of blocks, heads and gaskets without any issues.
 
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