There are significant differences between displays of the same iPhone model, due to different display panel suppliers (Samsung, LG, BOE), and sometimes also for panels from the same supplier, such as better or worse contrast and variations in color temperature. This is referred to as the “panel lottery” when buying an iPhone.Are you sure about the display? In what way is it better?
I got a regular iPhone 17 to replace my 13 mini. First thing I noticed was how bad the display was on the new phone. A white background such as this text box veers wildly in colour – green, magenta – as I tilt the phone back and forth. My mini 13 display, side by side, has much less colour shift. The difference isn’t subtle.
I had one mini with that green-magenta tilt shift. I also had two minis without it from a different panel supplier (as indicated by 3uTools), but one had significantly better contrast than the other despite being from the same panel supplier. I also measured visible differences in color temperature.
The iPhone 17 has a much better display in terms of advertised brightness, ProMotion, and AOD, plus the improved Ceramic Shield coating.