The second one looks like Agave harvardiana or at least an Agave sp. from subgenus the Agave. The first one looks like a new world Dasylirion or Agave sp from subgenus Littaea. I have a vague memory that says I may even be in the wrong family? Simon
Lovely photo and composition. Your Agaves have multiple florettes per stem. Want an additional clue/photo?
If those things are both classified in Agave, I'd say it is high time the genus was reviewed and split into two or more separate genera!