I am not sure there are different species, Wikipedia says one species and mentioned at some point some thought there might be more than one. [1]
An article published in New Zealand Geographic in 2002 [2] mentions multiple species a number of times but also states that Marine Biologist and taxonomist Emeritus Professor Philip Roy Pugh (RIP 2021) does not agree:
> Phil Pugh, an English expert on world siphonophore jellies (of which the bluebottle is one), thinks not. He believes there is only a single worldwide bluebottle species, Physalia physalis, but that it varies greatly in size.
Philip Pugh described a quarter of all known siphonophores [3], more than any one person. So he probably knew what he was talking about.
There is a tendency in certain areas of biology to attribute extremely minor regional variation to new species.
[1] https://en.wikipedia.org/wiki/Portuguese_man_o%27_war