The answer to 'difference between panel upgrade' is that a panel upgrade involves replacing an older, outdated electrical service panel with a new, modern one, while a panel replacement is the complete removal and replacement of the entire electrical panel. A panel upgrade typically costs less and is faster, but a full replacement may be necessary if the existing panel is too small, outdated, or in poor condition.
A panel upgrade can increase the capacity and safety of your electrical system, allowing you to add more circuits and meet modern electrical demands. It may also include upgrading the main breaker, adding new circuit breakers, and improving the overall electrical safety and efficiency of your home. A full panel replacement is a more comprehensive project that involves completely removing the old panel and installing a new one, which can be more expensive but may be necessary in some cases.