No, they don't and that is imposible.
On RGB header you have 12V power and G/R/B, that is actually ground for green/red/blue diods. So you have analog signal that is actually your ground resistance on each color, so it just change LED brightness from off to full 12v.
On D-RGB header you have 5V power plus data (digital signal) plus ground (same ground as on G/R/B, but not controlled by motherboard). So your led strip has its own RGB-controller, that powered up by that 5v power source, recieves digital signal, decodes it and lights up different diods, and instead of turning off every red diods in strip - it can turn off every single of its separately. (Or if you want dive into details - every led has a controller, that has his own address and thats why this leds called addresable; that controller recieves commands for its address from motherboard and controls led color as it was told)
Thats why RGB header can't do this:
If you get some sort of cable (like you can use d-rgb splitter that don't have that blocked/missed pin, which prevents incorrect connection to 12v header) - you will burn your led strip because it needs 5v instead of 12v.
Even if somehow you get that 12v down to 5v (like adding resistor) - there is no way to transform 3 analog RGB signals to a single digital addressable with just a cable. And yep, you also don't have regular ground on 12v header, that is also a problem, but a tiny one in terms of getting digital signal from 3 different analog sources including fact that these sources are not doing same job as digital one.
On RGB header you have 12V power and G/R/B, that is actually ground for green/red/blue diods. So you have analog signal that is actually your ground resistance on each color, so it just change LED brightness from off to full 12v.
On D-RGB header you have 5V power plus data (digital signal) plus ground (same ground as on G/R/B, but not controlled by motherboard). So your led strip has its own RGB-controller, that powered up by that 5v power source, recieves digital signal, decodes it and lights up different diods, and instead of turning off every red diods in strip - it can turn off every single of its separately. (Or if you want dive into details - every led has a controller, that has his own address and thats why this leds called addresable; that controller recieves commands for its address from motherboard and controls led color as it was told)
Thats why RGB header can't do this:
If you get some sort of cable (like you can use d-rgb splitter that don't have that blocked/missed pin, which prevents incorrect connection to 12v header) - you will burn your led strip because it needs 5v instead of 12v.
Even if somehow you get that 12v down to 5v (like adding resistor) - there is no way to transform 3 analog RGB signals to a single digital addressable with just a cable. And yep, you also don't have regular ground on 12v header, that is also a problem, but a tiny one in terms of getting digital signal from 3 different analog sources including fact that these sources are not doing same job as digital one.
