ACP2E-1117: CustomerAddressId not set for new billing address

Author: pradeep1819

app/code/Magento/Checkout/Model/AddressComparator.php

@@ -0,0 +1,53 @@
+<?php
+/**
+ * Copyright © Magento, Inc. All rights reserved.
+ * See COPYING.txt for license details.
+ */
+declare(strict_types=1);
+
+namespace Magento\Checkout\Model;
+
+use Magento\Quote\Api\Data\AddressInterface;
+
+class AddressComparator implements AddressComparatorInterface
+{
+    /**
+     * @inheritDoc
+     */
+    public function isEqual(?AddressInterface $shippingAddress, ?AddressInterface $billingAddress): bool
+    {
+        if ($shippingAddress->getCustomerAddressId() !== null &&
+            $billingAddress->getCustomerAddressId() !== null
+        ) {
+            $sameAsBillingFlag = ((int)$shippingAddress->getCustomerAddressId() ===
+                (int)$billingAddress->getCustomerAddressId());
+        } else {
+            $quoteShippingAddressData = $shippingAddress->getData();
+            $billingAddressData = $billingAddress->getData();
+            if (!empty($quoteShippingAddressData) && !empty($billingAddressData)) {
+                $billingKeys = array_flip(array_keys($billingAddressData));
+                $shippingData = array_intersect_key($quoteShippingAddressData, $billingKeys);
+                $removeKeys = ['region_code', 'save_in_address_book'];
+                $billingData = array_diff_key($billingAddressData, array_flip($removeKeys));
+                $diff = array_udiff(
+                    $billingData,
+                    $shippingData,
+                    function ($el1, $el2) {
+                        if (is_object($el1)) {
+                            $el1 = $this->serializer->serialize($el1);
+                        }
+                        if (is_object($el2)) {
+                            $el2 = $this->serializer->serialize($el2);
+                        }
+                        return strcmp((string)$el1, (string)$el2);
+                    }
+                );
+                $sameAsBillingFlag = empty($diff);
+            } else {
+                $sameAsBillingFlag = false;
+            }
+        }
+
+        return $sameAsBillingFlag;
+    }
+}

app/code/Magento/Checkout/Model/AddressComparatorInterface.php

@@ -0,0 +1,22 @@
+<?php
+/**
+ * Copyright © Magento, Inc. All rights reserved.
+ * See COPYING.txt for license details.
+ */
+declare(strict_types=1);
+
+namespace Magento\Checkout\Model;
+
+use Magento\Quote\Api\Data\AddressInterface;
+
+interface AddressComparatorInterface
+{
+    /**
+     * Returns true/false, if shipping address is same as billing
+     *
+     * @param AddressInterface|null $shippingAddress
+     * @param AddressInterface|null $billingAddress
+     * @return bool
+     */
+    public function isEqual(?AddressInterface $shippingAddress, ?AddressInterface $billingAddress): bool;
+}