Differences between "Castillian Spanish" (I don't like that term at all, more on that on [1]) and Latin-American Spanish are only on pronunciation of some consonants. The Royal Spanish Academy (Real Academia Española) accepts allow all of those dialects as rightful variants of Spanish language.

[1] What some politicians call "Castillian Spanish" is the Spanish language spoken in all parts of Spain. It is idiotic to call "Castillian" to a language were some dialects of Spanish (West/East-Andalusian and Canarian [from Canary Islands]) are very similar to Latin-American Spanish.