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difference between 1259 and 2785 gasket

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Shermanator:
In my HP rebuild kit I got two air horn gaskets.  One marked 1250 and the other marked 2785.  I cannot see any difference between them and they both seem to match the gasket that came out.  What am I missing here and what should I be looking for to determine which to use?  My carb number is 17066575.  This is a service replacement that I bought from a Chevy dealer in about 1990 as the correct carb for my 1982 K20.

Shermanator:
Just noticed that I have a typo in the subject line.  The gaskets I received are marked 1250 and 2785 as stated in the body.

Frank400:
Measure the thickness of both.  I'm pretty sure Cliff makes a gasket that is a tad thicker to compensate for slight warpage or mismatch between the parts. 

  I may be wrong but not a big deal to check that.

   Frank.

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