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I can't understand fully your question. Varieties of the Spanish language --also called "Castilian" due to political reasons-- are over all in Spain, from North to South, from South to North, from East to West and from West to East.
Accents --understood as ways to pronounce a language-- are varying while moving along a territory where that language is spoken, from a region to another different region, from a province to another one, sometimes even from a town to another different one in the same province.
But I can't get the sense of your main question. Varying from a better standard to a worse standard accent? And if it were so, referred to the pronunciation, to the use of the grammar and syntaxis?
As said, I'd need a clarification, Tooting. Thank you.
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