Why would one phone be compatible on a network but another not?

I lost my Asus Zenfone 8. I'm borrowing another one which has all the same specs per [imei.info](https://www.imei.info/) . However, when I [check the device's compatibility with the Cricket network](https://www.cricketwireless.com/prepaid-phones/bring-your-phone) , his phone shows as incompatible. When I enter my lost phone's IMEI, the site says it's compatible. I'd like to understand how this could be. i.e. why would phones with the same hardware be listed with different compatibilities on any given network?