ValueChecker.php

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<?php
namespace Magento\Theme\Model\Design\Config;

use Magento\Framework\App\Config as AppConfig;
use Magento\Framework\App\ScopeFallbackResolverInterface;

class ValueChecker
{
    protected $fallbackResolver;

    protected $appConfig;

    protected $valueProcessor;

    public function __construct(
        ScopeFallbackResolverInterface $fallbackResolver,
        AppConfig $appConfig,
        ValueProcessor $valueProcessor
    ) {
        $this->fallbackResolver = $fallbackResolver;
        $this->appConfig = $appConfig;
        $this->valueProcessor = $valueProcessor;
    }

    public function isDifferentFromDefault($value, $scope, $scopeId, array $fieldConfig)
    {
        list($scope, $scopeId) = $this->fallbackResolver->getFallbackScope($scope, $scopeId);
        if ($scope) {
            return !$this->isEqual(
                $this->valueProcessor->process(
                    $value,
                    $scope,
                    $scopeId,
                    $fieldConfig
                ),
                $this->valueProcessor->process(
                    $this->appConfig->getValue($fieldConfig['path'], $scope, $scopeId),
                    $scope,
                    $scopeId,
                    $fieldConfig
                )
            );
        }
        return true;
    }

    protected function isEqual($value, $defaultValue)
    {
        switch (gettype($value)) {
            case 'array':
                return $this->isEqualArrays($value, $defaultValue);
            default:
                return $value === $defaultValue;
        }
    }

    protected function isEqualArrays(array $value, array $defaultValue)
    {
        $result = true;
        if (count($value) !== count($defaultValue)) {
            return false;
        }
        foreach ($value as $key => $elem) {
            if (is_array($elem)) {
                if (isset($defaultValue[$key])) {
                    $result = $result && $this->isEqualArrays($elem, $defaultValue[$key]);
                } else {
                    return false;
                }
            } else {
                if (isset($defaultValue[$key])) {
                    $result = $result && ($defaultValue[$key] == $elem);
                } else {
                    return false;
                }
            }
        }
        return $result;
    }
}