Dell G5 5590 Motherboard KW84T / I7, GTX1650 - 12V, 5V Fan?

Can someone please tell me, if i have 5V Fan stock, can i switch to 12V ?
I had in mind that its just a question about the power adapter and not about the “wiring” on the board itself right ?
Or does it get difficult to even get the 12V in the “Fan-Rails”, so the only solution would by custom diy ?

I would say its super logic that 12V just can be used if the power overall is given, but now i am totaly unsure…