For what it's worth, swapping out material/ updating parts and not changing model numbers already happens a lot in consumer tech. Making changes after launch and initial mass production runs in order to average down cost or fix known issues is a fairly common practice at large hardware companies (Apple/Google/Samsung/Tesla). It's seldom changing the display or battery size or anything immediately customer facing, but there's hundreds of components that each act as a knob for performance and cost that get tweaked over time.