The information is similar to speculation, but there are several factors that speak in favor of separation.
First, in iOS and iPadOS 14, Spotlight results are no longer referenced by Google, but labeled as "Siri Suggestions."
Secondly, the Applebot search robot has learned to crawl web pages, which it could not do before.
Thirdly, the Apple team attracts all the new employees associated with the development of artificial intelligence.
This means that Google may lose the default browser status in Safari.
What to expect from Apple's new search engine
Of course, Apple will not copy what already exists, because their goal is to move the monopolist Google. Most likely, a branded search engine will abandon advertising promotion and focus on personalization and data protection. At least this is in line with Apple's strategy in recent years.
With regard to SEO, the system will bring new opportunities for professionals and open up new ways to promote.