Очень наглядно и удобно:
https://appstudio.org/iphone/
https://appstudio.org/iphone/
https://www.techwalls.com/iphone-8-plus-model-number-differences/
Не только Apple:
https://www.gadgetsnow.com/compare-tablets/Apple-iPad-Air-2-WiFi-32GB-vs-Apple-iPad-Pro-97-WiFi-256GB-vs-Apple-iPad-Air-32GB-Cellular