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I have a theory, and it is borne out of running a XT600 Tenere single with a DPR8EA9 fitted in summer, and a DPR7EA9 fitted in winter, for ease of starting the "thing" (or is it the other way round? - corrected, thanks WoodsieIII)!
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I seem to remember a Triumph shop bulletin or owner's manual reference from years ago that suggested the 9's for summer/hot climates and the 8's for winter/cold climates.
Sorry I can't remember the exact reference.... maybe on the Trophies?
Anyhow, if the bike has been rejetted for a richer mixture you should use the hotter plug since there's more evaporative cylinder cooling.
Jim
Jim