Remove accents - [\\ p {InCombiningDiacriticalMarks}] vs [^ \\ p {ASCII}]

I created a code in Java to remove the accents like the following:

private String removerAcentos(String texto) {
  texto = Normalizer.normalize(texto, Normalizer.Form.NFD);
  texto = texto.replaceAll("[\p{InCombiningDiacriticalMarks}]", "");

  return texto;
}

I would like to know the difference between [\p{InCombiningDiacriticalMarks}] and [^\p{ASCII}] .