A statement by the Moetzes is incomparable to a statement by the RCA. The Moetzes is constituted by some of the greatest tzadikim and gedolim of our dor. It is not a group of any or all rabbis, but rather only of the greatest. And they work on consensus.
OTOH, an RCA statement is simply a majority vote of all $350 (or whatever) annual dues-paying member rabbis. And membership constitutes from the far-left (such as Avi Weiss until recently when he elected to not renew his membership) through the MO-right. And while they surely have some big talmidei chachomim, most voting members are not gedolim but rather far flung pulpit rabbis and even people working in secular fields that have smicha. And they can outvote the gedolim.