For example:
Automachef - https://steamdb.info/app/984800/subs/
has this - SA - specific package:
381450 Automachef (South America)
so all those countries can test it: Argentina, Bolivia, Brazil, Chile, Colombia, Costa Rica, Cuba, Dominican Republic, Ecuador, French Guiana, Guatemala, Guyana, Honduras, Mexico, Nicaragua, Panama, Peru, Puerto Rico, Paraguay, El Salvador, Suriname, Uruguay, Venezuela
The Occupation - https://steamdb.info/app/765880/subs/
has this - LA - specific package:
437449 The Occupation (Latam)
so all those countries can test it:
Argentina, Brazil, Chile, Colombia, Costa Rica, Mexico, Peru, Uruguay
Sid Meier’s Civilization: Beyond Earth - https://steamdb.info/app/65980/subs/
only has a Brazil specific package, so no point checking it in other LA countries
95220 Sid Meier’s Civilization: Beyond Earth (BR)
Every game/package can have a different country scope - regardless of what it’s called. Best example above (LA being narrower than SA - wut???)
EDIT: and unless you see your country on the inclusion list of any of the region locked packages of any of those games - there’s no way any of those keys will work for you.