I don't know if there is such thing. These are separate courses because some grammar uses, pronunciation and a few pieces of vocabulary are generally different from one region to another. It doesn't mean that the Spanish learnt in one region is useless somewhere else: the general features of both regions are grouped for functional reasons.
Educated Spanish is understood everywhere, but both contexts are different; just like learning British English is not the same as learning American English or Australian English, and formal courses don't mix them.
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