Strange sanyo caps

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Today I got a second nobsound tpa3116 which I have no complaints about but when looking at the caps inside I noticed that they have different style vents.
Both amps have the same sanyo wx 470uf 35v caps, same sleeve, same values but different vents. Usually vents are the same within one brand and within a certain range of values, so does this tell they're not genuine ? Wouldnt be shocked as its a chinese product after all but maybe some can explain?!
all the best
Arne