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"I'm hoping someone knows fields that a network card have that devices wouldn't have (or vice versa)."
"So the question 'How can I recognize a network card in the output - not specifically mine' is more appropriate."
You can't separate a device from its network adapter. Every packet that a device sends is sent using its network adapter, whether it's a separate card in a slot, or an integrated onboard adapter. All you can tell from the MAC address is the manufacturer. A Broadcom card is a Broadcom card, whether it's a separate network adapter on a card or an integrated adapter.
There are no fields that a "device" has that its network adapter doesn't have.