Windows: Toggle front or back audio jack using software

This is definitely a hardware issue, do not waste your time anywhere else. Either your replacement is faulty or probably dirty; you should try some compress air and see before replacing the just added pcb for a new one.

As a reference you can see here a "similar" issue also with a RealTek

I was able to figure out a solution based on the response to this question here:

I found another simple solution for this. If you have installed the Realtek software, open the Realtek HD Audio Manager , and check the " Disable front panel jack detection" option, under connector settings in the right side panel. The headphones and other audio devices work like a charm.

Although, when I went to the Realtek HD audio manager I had to click on "Device advanced settings" and then change the audio detector to "Multi-stream mode". That instantly separated the audio outputs for me.