I don't understand what you mean by "white box".

Just look for yourself it's really not hard to find: https://www.dell.com/en-us/lp/linux-systems

Sure, I can look up Dell Linux products. However, the assertion was that they're just branded white box computers, so Im asking what the white box equivalents are, and to what extent they're really equivalent.

I didn't understand it that way at all. The assertion, as far as I understood, was that the Linux machines were the same ones that were sold with Windows on them otherwise. Which is true, Dell sell the same hardware with Windows or Linux.

Ah, I see your claim.

Is the firmware confirmed to be the same? Even with the same chips, the firmware would likely diverge between Windows and Linux (ACPI code, BIOS, EC, etc)