Short answer: no it can’t.
Long answer: Physical display configuration seems to be in an immutable part of the flash which can not be overwritten. If that says 4.3", it won’t accept 5" or 7" TFTs. It’s not plug and play, so if you replace just the LCD panel, the processor will continue to address the original native resolution. Afterwards, more things to consider: backlight power (which is elevated for bigger panels) and so on. I do not think that such an approach would really save money, seen the time and hardware you’d invest in attempts which will most probably fail.