It’s quite likely, I think. Agatha’s great-grandfather & the brother of Zagnut and Ominox, Saturn/Saturnus’ dad, is never explicitly named, and could therefore be Pluto. However, Agatha could also have had a grand-uncle (brother of Saturn/Saturnus), which would fit a naming scheme better than a father giving a son an astrologically inspired name.
Also, depending on whether the police are normal humans made invisible, or constructs that aren’t necessarily ageing, a brother could fit the chronology better. If the Chief is ageing, he’s not old enough to be made by Agatha’s great-grandfather.
I’m thinking Pluto Heterodyne is probably close to Saturn in the chronology. The two sound like they’re part of a set
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