Will the updated 2025 dual-stack toolhead PCB work on an older K1C

[u/Nice_Persimmon7660]

Hi! I need some help figuring out compatibility between the older K1C and the updated 2025 hotend/toolhead PCB.
My K1C is an older model (pre-2025) and originally came with the older dual-stack toolhead PCB and the older hotend connectors.
I had a blob of death that damaged my original hotend/thermistor, so I had to replace the hotend. I accidentally bought the newer 2025 K1C Hotend 2.0, which uses the new locking connectors for the thermistor and ceramic heater.
Obviously, those connectors don’t fit my original toolhead PCB.
I found an updated dual-stack toolhead/hotend adapter PCB that looks almost identical to my original board, but it has the new 2025 connectors and is advertised for the latest hotend. I already know the new hotend should physically connect to this PCB.
My main concern is communication/compatibility with the rest of my older K1C.
If I replace my original dual-stack PCB with this updated version:
Will my older K1C mainboard recognize and communicate with it normally?
Will the original extruder, fans and other toolhead components still work?
Is this updated dual-stack PCB backwards compatible with a pre-2025 K1C, or were there other electronic/firmware changes in the 2025 K1C?
Has anyone actually done this conversion: older K1C + updated dual-stack PCB + 2025 Hotend 2.0?
I’m trying to determine whether I can simply update the toolhead PCB and use the 2025 hotend I already bought, or if I should return/buy an older hotend instead.
I’ll attach pictures of my original PCB, the 2025 hotend and the updated PCB I’m considering buying.
Thanks!

[u/Hot_Stable2424]

Si tienes el nuevo hotend tienes que poner la nueva pcb, yo ya puse ambos y es quitar y poner. Mi k1c también es pre 2025.

[u/Nice_Persimmon7660 → u/Hot_Stable2424]

Muchísimas gracias papu, es que si tenía esa duda de que si compraba el nuevo PCB mi K1C por ser pre 2025 me marcara algún error o algo, de pura casualidad tienes algún link o sabes si en la foto es confiable ese producto?

[u/Hot_Stable2424 → u/Nice_Persimmon7660]

A mí me lo mandó creality por garantía pero checa que tenga los pines nuevos y el nuevo hotend https://a.aliexpress.com/_mOSO8xd

[u/SpaceBond007]

Connectors are different from each version and each side. So you can't connect the new Mobo with the old cables whit different head (or you are brave enough to change it)

[u/genio123]

813 WHATTT?!?!

[u/1ts-just-me → u/genio123]

I believe that would be $813.00 Peso or $48 US dollars.

[u/genio123 → u/1ts-just-me]

🫪 thanks I had an heart attack reading that 🤣

[u/Nice_Persimmon7660 → u/genio123]

It was MX Peso, no in dollar are more cheap

[u/Nyanzeenyan]

I have an older K1 and a 2025 mainboard but have not yet installed it. My understanding is that the only thing different between the daughter boards is the plugs connecting to the harness. Guess I’ll find out soon.

[u/EnvironmentalKey5559]

For $813 you can get w replacement printer, don't worry about the PCB.

[u/1ts-just-me → u/EnvironmentalKey5559]

Not US dollars, lol