Z's and S's are pronounced similarly in Latin American Spanish. Perhaps the z in zebra resounds a bit more than the s in seda. but they are nearly completely interchangeable to my ear.
In Spain Z's follow the C rule in front of the letters E and I. By the way, ZE and ZI are almost nonexistent in Spanish except for words borrowed from other languages like zebra and zika
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Me ayuda si corrige mis errores. Gracias.
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