The answer to 'difference between panel upgrade' is that a panel upgrade involves replacing your home's entire electrical service panel, while a panel change-out simply replaces the panel itself. A panel upgrade increases your home's electrical capacity, allowing you to add more circuits and handle higher electrical loads. This is often necessary for older homes or if you're planning major renovations that will require more power. A panel change-out, on the other hand, simply swaps out the existing panel with a new one of the same capacity, without increasing your home's electrical capabilities.
The key differences are the scope of work, cost, and electrical capacity. A panel upgrade is more extensive and expensive, but provides long-term benefits like future-proofing your home's electrical system. A panel change-out is a simpler and more affordable option if your existing panel is in good condition and you don't need to increase your electrical capacity.