That first vid starts off with the bell playing what sounds like a Mozambique but then it levels off into a straight 'Son'. Based on the title and the lyrical content, I'd say it's a Guaracha-Son done Charanga style.
Like someone noted earlier, Charanga is a format and not a rhythm. Pachanga is not a rhythm either and is a dance style developed in NYC. It's also a term associated with a "party." People then and now use the term in the same way the term Mambo and Salsa are used everywhere. As a category to mean Afro-Cuban dance and music.