Not much different but enough to be dangerous. Older Windows use Trident, 10 still uses EdgeHTML, many people are stuck with old Androids that don't have up to date engines (not sure if Android is a target, wasn't easy to find in their website), and webviews have access to the system in ways a website doesn't (like reading files or using the camera without having to ask for permission or being allowed to issue requests to arbitrary domains).