Reset vs erase all content and settings
Will my new iphone 14 information get erased if I erase all content and settings from my iphone SE after the transfer is completed to the iphone 14?
iPhone SE (Gen 3)
No. Also note that you can do all of the steps in the following support article on the old phone without affecting the new one: What to do before you sell, give away, or trade in your iPhone or iPad - Apple Support