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jQuery(document).ready(function($) {

  if( acf.fields.color_picker ) {
    // custom colors
    var palette = ['#000000', '#333333', '#1D3278', '#E41E41', '#F1F1F1', '#FFFFFF'];

    // when initially loaded find existing colorpickers and set the palette
    acf.add_action('load', function() {
      $('input.wp-color-picker').each(function() {
        $(this).iris('option', 'palettes', palette);
      });
    });

    // if appended element only modify the new element's palette
    acf.add_action('append', function(el) {
      $(el).find('input.wp-color-picker').iris('option', 'palettes', palette);
    });
  }

});

<?php
// CUSTOM ADMIN COLOR PALETTE
// Place BELOW the initial script and styles enqueue function
add_action( 'acf/input/admin_enqueue_scripts', function() {
	wp_enqueue_script( 'acf-custom-colors', get_template_directory_uri() . '/library/js/color-picker.js', 'acf-input', '1.0', true );
});
?>