You should be able to mis-match CPUs as long as the Rev is the same.
(The C in Cg and C0)
The 0-G are usualy due to small changes.
Rather then trying to get the same stepping for a retail CPU, see if the retailer can get CPUs with very close serial numbers. They should then be the same rev and stepping.
You are correct though to have concern, as it can cause stability issues if your CPUs are of completly different Rev's. But the chance that they would be incompatbile is still slim.
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