I have a site with a master language (en).
I have a page (es) already translated by a translation project. Then I update that page from my master language (en).
The launcher generated is full in English. The translator provider should translate full content again if they do not have a memory translation.
Is there a way somehow I can send only the content modified in my page, I should not pay for the translated content again?
I think you are referring to translation rules where you identify the content to translate for pages, components, and assets that are included in, or excluded from, translation projects.
Identifying Content to Translate