mosfet transistor date codes??

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Im replacing transistors in a couple Memphis st1000d's. I only need 6 irf640's and 12 irf9640's. Im unable to get matching date codes unless I order 50 of each from Mouser. I tried ordering from Jameco and the tech told me that transistors don't have date codes. Does anyone have any suggestions? And just how important are matching date codes?
 
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