iPhone 15, 15 pro and 15 pro max full will not be like regular iPhone 12,13, and 14. However, it’s not uncommon for each new iPhone model to have updates and improvements that distinguish it from its predecessors. The differences may range from design changes to new features, improved hardware and software capabilities, and more. So, it’s possible that the iPhone 15, 15 Pro, and 15 Pro Max could have significant changes compared to the iPhone 12, 13, and 14.
But until any official announcements or leaks, it’s difficult to say exactly what those changes might be or how significant they would be.