Yes, P. aquatica is as well. Note that if you acquired a "P. aquatica" in the horticultural trade, it's probably actually P. glabra. How big and what colour is the pod? P. aquatica pods are larger and brown, P. glabra are smaller and green.
It's worth noting that there's some controversy about the safety of eating pachira nuts, at least in quantity.
https://www.daleysfruit.com.au/forum/is-malabar-chestnut-toxic/Reports are mixed. Some people eat them just fine, but some have reported bad reactions. It may have to do with species, variety, genetics, etc. It doesn't make it any easier to wring out the truth in that people are constantly misidentifying species... Either way, I'd recommend cooking them just to be sure. Cooking dramatically reduces the content of cyclopropenic acids:
https://books.google.is/books?id=MaAZMbSxNt4C&pg=PA68&lpg=PA68&dq=cyclopropenic+fatty+acids+cooking&source=bl&ots=iBaEHgfgOG&sig=XvWrx16yBQlRBasrq_2y051kNRM&hl=en&sa=X&ved=0ahUKEwiuhdOckfTYAhWKL1AKHTl4BCoQ6AEIODAD#v=onepage&q&f=falseI found another paper that mentioned "major decomposition" of cyclopropanoic acids at 180°C:
http://onlinelibrary.wiley.com/doi/10.1111/j.1365-2621.1983.tb14837.x/fullYou'd obviously have to fry them in oil (deep frying temperatures = 190-225°C) or roast in a hot oven to reach those temperatures; boiling obviously won't cut it. But, the nuts are supposedly quite good roasted or fried...
Even raw though, sola dosis facit venenum.... "Everything is poison and nothing is without poison... it is the dose that makes the poison." Eat lots of food with oxalic acid and you won't like the result either. Theobromine is poisonous when overconsumed. Caffeine. Nutmeg is toxic and hallucinogenic. Heck, most spices contain oils that have been found to be carcinogenic or otherwise harmful in various ways (eucalyptol = reproductive toxicity, safrole = carcinogenic, eugenol = hepatoxic... need we even get started on tannins?) . And let's not open up the old annonacin can of worms!
But you also consume a lot of stuff that's good for you at the same time when you eat a diverse diet. So long as you don't overconsume something, I wouldn't worry. I eat rhubarb, chocolate, tea/coffee, nutmeg, spices, tannin-rich foods, and yes, annonas. And I would certainly eat the occasional pachira nut