OTOH, if Spain remains friendly to England (with England remaining Catholic, and maybe a marriage alliance with the Hapsburg), a future Spanish monarch might cede some of La Florida (which is what they called all of America north of Mexico) to England, since Spain had no interest in colonizing it for themselves.
In case of a lasting Anglo-Spanish alliance (cemented by marriage ties), it's almost a given that Spain will not only allow, but encourage and support English colonisation on the East Coast of North America. This would be vital primarily to ensure that any French foothold there is suitably limited.
Furthermore, the Anglo-spanish compact will probably entail than any Caribbean and South American possessions that England takes from the French and Portuguese (and maybe the Dutch, if that becomes relevant) will remain in English hands. England and Spain will presumably engage in rather free trade with each other, and they'll have reasonable access to each other's colonies.
This may therefore lead to an English Brazil (not
necessarily covering all of OTL Brazil), and different English colonies in the Caribbean.
In North America, it seems to me that the initial divide will be that Florida and everything West of the Appalachians will be Spanish, but that England is free to settle the Eastern coast and anything North of the Mississippi watershed. Considering the limitations of Spanish demographics and the sheer amount of land they'd have under their aegis, I suspect that in the long term, the Mississippi basin will be settled by the English (provided they can beat the French, which I consider very plausible).
As you mentioned in post #9, it's quite credible that the Spanish would treat Florida as a vassal realm, primarly inhabited by natives. In the event, I think this would then be organised into a separate (though firmly Spanish-aligned) kingdom, whereas the Mississippi basin (and probably a slice of OTL Texas) would join the English colonial empire. The greater share of Texas, as well as everything West of the Rockies, would remain Spanish.
...We can imagine all sorts of fanciful spin-off effects, such as the English involvement in Brazil eating up a lot of attention, which might then allow the French (locked out of the New World) to in turn beat the English to India (and perhaps to Australia). Similarly, a Portuguese Indonesia might be an interesting prospect to entertain.
