Merc 2.4 head gaskets

I have a '79 Merc 200 HP 2.4. Runs great. Took a compression check. Right bank 120. Left bank 130. Ah, different head gaskets, I can see visually. Measured .040 vs .050 (1.0 vs 1.2 mm) Researching through the forums, I can't find a part number for the 1.0t 2.4. So, will a thin head gasket for a 2.5 work on a 2.4? Or, is there a part number I haven't found yet?
I have not removed the heads yet, so not sure on the block details. Sleeve bolts, vs the block bolts, etc. And being 39 years old, 3 owners, anything could have been done to it by now. Just want to match the thin gasket that's on there now.

My advice is leave the heads on.A .010 difference in gasket thickness would not render a 10 pound compression increase, one or two...possibly.More likely the head was cut in the past.The motor won't mind the difference,and the gaskets,(inside bolt pattern)are scarce and expensive.You may also encounter a bunch of breaking or stripping head bolts,especially if its seen salt water.If you insist,I have the gaskets,but I would leave the sleeping dog alone,Chris

That was my alternative thoughts. Something happen in the past, and a stock head and gasket were used to replace. So heads may be different. I'm still in the 10% range, so not broke, don't fix! And head gaskets are expensive, when just taking a look. Was just interesting that each side was a constant number.

Im with Chris if it ain't broke run it

As usual good advice from Chris.Big risk of breaking bolts on that one!