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This isn’t even true with other common ‘digital’ cables.

Not all ‘Ethernet’ cables are the same. Someone will give you 100mbit. Some will give you a gigabit. Some will give you even more. They’ve all got RJ45 on them.

“All HDMI cables are the same” is an almost-baseless corruption of a very valid critique of Monster et al.

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RJ45 is just the plug. Ethernet cables are labeled with category 5, 5e, 6 etc.

8P8C is the plug.

RJ45 is a wiring pin-out standard for that plug [1]. It's also a standard for telephony, not networking -- it carries one phone line. A gross waste of pins if you ask me.

[1] Not quite. An RJ45S plug has a tab on the side that will not insert into an 8P8C jack.

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