Yes, that appears to be the later combo reg/rec. To use it on your older motor, you need to unground one of the brushes on the alternator by changing the mounting screws to plastic or nylon. Take a look at your brushes to see if that has been done. By the looks of that melted connector in your second pic, I'm thinking it hasn't. I'm not 100% up on the "fix" because I never did it but if you search "brush mount plastic screws", you should find the info you need. It has been covered here.