Difference between 2/4 channel logic level converter?

Other Hardware General Electronics
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There are these commonly used bi-directional logic level converter boards: https://www.aliexpress.com/item/32780195206.html

They always have 12 pins, but one variant sold as "4-channel" and the other variant is sold as "2 channel".

The 2-channel version has its pins named "TX0, RX1, HV, GND, TX1, RX0, LV, GND, RX0, TX1".
The 4-channel version has its pins named: "HV1, HV2, HV, GND, HV3, HV4, LV1, LV2, LV, GND, LV3, LV4"

The RX/TX markings makes you wonder if it is only good for use with UART.
And it also makes you wonder if the 2-channel version is actually a directional logic level converter with 2 channels in each direction.

So what are the actual technical differences here? Should I just always get the 4-channel version?

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Both of them will work as 4 channel level shifters for individual data lines

The "2 channel" one is referring to 2 serial channels but, of course, each serial channel uses 2 data lines

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