Thanks for posting to the forums. I hope you're well!
Your URLs would be the same, as long as your product, collections, pages are all the same title, along with your domain. That being said, it could still impact your SEO as your .myshopify.com URL would be different. Thus, you would need to resubmit your sitemap to Google via Google Search Console to crawl. I recommend checking out this article in regards to best practices when making domain changes.
In the meantime, can you provide me more information on why you would need to use multiple Shopify accounts for the same store? It is generally best practice not to transfer your domain as to maintain your SEO.
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