I have what I think is an NOS PCB. Sure looks it! I got some NOS Technos PCBs years ago. Wrestlefest, Combatribes, and I think this DD3. I think that I have a header here somewhere as well. Price for PCB is $150.
Yeah, definitely the worst of the series. I know the console ports were way different but DD3 on NES was so bad and ridiculously hard. AVGN did a video on it and most of the time he beats the game he's reviewing but he explains that it's impossible and doesn't finish it.
But I hope you find your PCB. Everyone has their own taste in games, who cares what we think?