HX6970 versus HX6960

Has anyone noticed or is it factual that the HX6970 black Philips is more powerful than HX6960? I was sent a replacement for one of my Black HX6970 handles (two in the set with charger from Costco) The white replacement HX6960 seems far less powerful. I was thinking of sending it back and asking for a replacement of my exact model if there is a power difference . Is it just me or is there an actual difference in power? It seems to be not as intense of brushing on the identical "clean" setting and the other settings are worthless and it's missing the max and go care.

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