To modern Spanish, very little difference. It was not consistent in past times either, with classic authors from the Spanish golden age using varying spellings.

To modern Spanish, very little difference. It was not consistent in past times either, with classic authors from the Spanish golden age using varying spellings. Just wanted to point out that the variation of sound is not random, but with the sound tied to the letter. Also Spain has something that English does not, which is an official organisation studying the language and making official rules recognising how it's used at different contexts and zones.