So The 24pin adapter arrived and I started to repin it to match the old server power supply. Ran into a snag. The Dell power supply needs seven 12v connections on the 24pin connector. The ATX 2.01 standard only has two.
So I have to rob 12 volts from another connector. The Server still requires the 8pin CPU/EPS connector so I can’t rob that. I’m also using a GPU so I need the PCI-E connector. The new power supply has Molex and SATA. Looking at the pinout for SATA and it does require 12 volts but I don’t think SSD drives use it. I doubled checked the datasheets for both of the SSDs and they didn’t mention 12V but did mention 5V.
So I think I got it sorted out. I really don’t want to end up using the stock Dell power supply let alone two power supplies.