Very interesting discussion. Well I don't know much about these knives, but the one with the arrows is the "Falange" knife, whereas the other is supposed to be the "carlista" one (at least this is what the description says, I can't tell). They are different versions, different knives, actually: people from Falange and carlistas belonged to two different and antagonistic (though they both fought in support of Nationalist Spain in the Spanish Civil War) groups.
Another one "carlista" here for sale in Todocolección:
Be careful, by the way with TC. There are some fakes, here and there, as you probably know.
(Admin Edit: link removed. Please copy the photos and upload them to the thread. Once that sale item is removed from the external website so are the photos and we will never know which knife was being discussed. Thanks!)