Hello @mburridge , thanks for your answer.
Well, I tried using two different package themes, everything seemed two work ok in localhost until I deployed to Vercel. This is my settings file. If I replace https://andes.alexfernando.vercel.app/ by http://localhost:3000/ everthing works in my localhost, but I understand that I need to change the matching URL when I deploy. This is my trial deployment link: https://andes.alexfernando.vercel.app/ where you can see that the Spanish version doesn’t work.
const settings = [
//english site
{  
  "name": "andes-headless-english",
  "match": ["https://andes.alexfernando.vercel.app/"],
  "state": {
    "frontity": {
      "url": "https://test.frontity.org",
      "title": "Andes Website English",
      "description": "A website for the ONG Andes English Version"
    }
  },
  "packages": [
    {
      "name": "andes-theme",
    },
    {
      "name": "@frontity/wp-source",
      "state": {
        "source": {
          "api": "https://en.andescusco.info/wp-json/",
          "params": {
            per_page: 100,
          },
          "postTypes": [
            {
              type: "singlesearch",
              endpoint: "singlesearch",
              archive: "/search",
            },
            {
              type: "cardimage",
              endpoint: "cardimage",
              archive: "cardimage"
            },
            {
              type: "toolkitposts",
              endpoint: "toolkitposts",
              archive: "alltoolkit"
            },
          ],
          "taxonomies": [
            {
              taxonomy: "typeofpublication",
              endpoint: "typeofpublication",
              postTypeEndpoint: "singlesearch",
              params: {
	              per_page: 100,
                _embed: true
              }
            }
          ]
        },
      }
    },
    "@frontity/tiny-router",
    "@frontity/html2react",
    "frontity-contact-form-7"
  ]
},
//SPANISH SITE
{
  "name": "andes-headless-spanish",
  "match": ["https://andes.alexfernando.vercel.app/es-(.*)?$"],
  "state": {
    "frontity": {
      "url": "https://test.frontity.org",
      "title": "Andes Spanish",
      "description": "Configuration for Spanish Site"
    }
  },
  "packages": [
    {
      "name": "andes-spanish-theme",
    },
    
    {
      "name": "@frontity/wp-source",
      "state": {
        "source": {
          "api": "https://es.andescusco.info/wp-json",
          "params": {
            per_page: 100,
          },
          "postTypes": [
            {
              type: "singlesearch",
              endpoint: "singlesearch",
              archive: "/es-search"
            },
  
            {
              type: "cardimage",
              endpoint: "cardimage",
              archive: "cardimage"
            },
            {
              type: "toolkitposts",
              endpoint: "toolkitposts",
              archive: "alltoolkit"
            },
          ],
  
          "taxonomies": [
            {
              taxonomy: "typeofpublication",
              endpoint: "typeofpublication",
              postTypeEndpoint: "singlesearch",
              params: {
                _embed: true
              }
            }
  
          ]
  
        },      
      }
    },
     "@frontity/tiny-router",
    "@frontity/html2react",
    "frontity-contact-form-7"
  ]
}
];
export default settings;
Thanks in advance.