It all depends on the gun and who is buying it. If a gun in a particular year and given serial number block are known to have grips numbered to the gun, then un numbered grips would be considered a mismatch or field replacement. If the serial number block is known to be spotty as far as grip numbers, then its ok.
As far as who is buying it; some collectors allow things like non matching mags, firing pins and grips slide, since they are considered "normal wear' of the gun, while others would not consider a gun unless all that matched.
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