No, it just means that calibration procedures are very similar for older and newer Rumbles. Calibration values are not specs.
I honestly don't care much about wattage ratings - they are only one among various factors that determine the actual loudness. I'm more interested in GlennA's frequency response plots of the Bright/Contour/Vintage modes because they reflect what I hear (or think I hear) when I set them. And I also turn up the mid EQs a bit and lower the bass and treble to achieve what I think is a flatter response. I'm hoping to conduct my own tests, just for fun because, once again, as long as I can set it to sound the way I like, it's all good.