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It makes no difference whether the hen or rooster is a RIR or EE in determining the color fo the eggs. The egg color is determined by whether the offspring inherit the blue egg gene and it can come from either parent. If the EE has one copy of the blue gene, which is most likely, half the offspring will lay a green egg (blue mixed with brown =green) and the other half will lay brown eggs. If the EE has two copies of the blue egg gene, not likely, usually only Americaunas have two copies. In that case, all the offspring will lay green eggs, as it only takes one copy of the blue egg gene to be inherited to produce green eggs because it's dominant.