how to setup 2 work definition with the same output item but on different machine?

Summary:

Want to setup 2 same work definitions with one having a different output qty because it uses a newer machine which yields a higher value. How can we do this considering that both output has the same standard cost? What is the effect when doing cost rollup? 

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Version (include the version you are using, if applicable):

using Oracle Fusion Application ver 25B

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