Here 100 parts are assigned with a material ID of "X". As we are changing the "X" value, the changed value will be applicable for all 100 parts. No need for a part ID. In a single command, you can do it.
X be the Material ID.
MP,DENS,X,5.2, ! tonne mm^-3
MP,EX,X,1000, ! tonne s^-2 mm^-1
MP, NUXY,X,0.3,
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