This is from a Tolkien letter and since it mentions Gil-gilad, their increase in stature was to resemble the Noldor. So, size wise, their probably wasn't any difference at the height of Numenor. Whether they equaled the Noldor in strength, I don't know.
"The Númenóreans ... are in constant communication with their ancient friends and allies, either in the bliss of Eressea, or in the kingdom of Gilgalad on the shores of Middle-earth. They became thus in appearance, and even in powers of mind, hardly distinguishable from the Elves..."
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