Can use IP address if domain not available to upgrade prestashop and WordPress?

If I buy a new VPS and migrate first blog WP site And PrestaShop site … how can upgrade these (since needed upgrade) without touch original old server domains… ?
In other words upgrade isolated from public, public will be old server, after upgrade success point domains to new server? Can use IP address if domain not available to upgrade prestashop and WordPress? Also can upgrade localhost/blog/ or localhost/shop/ after upload upgrade files and database? In case localhost use localhost or 127.0.0.1…?

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