I need another Sata 15pin power supply, I have an old PSU that has some sata connections on it.

My question is this. Would it be ok to splice a 15pin onto one of my unused molex for the added power supply?

I know how to splice wires and do my own home electrical and car electrical

I just know that PSUs are usually a fussy part and honestly I'm just being lazy as a molex to sata is only like $3 but hey i dont want to leave home and need the sata.