Proofing Husky Opaque (Uncoated sheet)

Been increasingly getting my feet wet into M0 vs M1 characterization. Harvesting the data from the press sheets is a cinch, using the current crop of M1 instruments such as with the Minolta FD-9. But what about proofing? Does one really need a proofing substrate with a "matching" white point? Here, inspecting the measurements with PatchTool, Husky Opaque unprinted paper yields 93.21 2.10 -8.53 using M0 and 93.53 2.30 -10.97 using M1. Does it mean that I need to find a proofing substrate close to a b* = -10.97? To have a fighting chance at an acceptable visual match? Best / Roger