I suppose that was directed at me? Well, there are a lot of variables in this stuff, little cast in stone! I posted what I did based on other's information, but regardless, double check everything. It was my understanding that there was no difference in adapter plates for Cummins/Dodge automatic installs, and that the A-618 was just beefed up internally with no exterior change from A-518. The torque converters are however different.
I bought a replacement torque converter for my '90 Dodge Ram A-518 and asked for lockup. I received the TC and decided I wanted non-lockup and returned it. The parts store called the torque converter manufacturer and THEY SAID THEY WERE THE SAME, LOCKUP or NON LOCKUP! That's part of where I got my info, from a company that manufacures the TC's, so I figured it was pretty reliable.
A-518's come in lockup or non lockup. The only externally visible difference between the trannies is the input shaft, with one being fully splined and the other being partially splined. I had both and compared, seeing that there was no other difference externally in lockup or non-lockup.
In further research: if you're going to use an A-618 then you want the '94-'02 adapter which is 1" thicker, plus the correct starter, plus the 2nd Gen flexplate.
I'm sure it's frustrating for you, and it was for me in my swap, especially with no 4BT Swap forum around to ask questions! I went to other Dodge forums and asked questions politely. I found that you get a lot better feedback tossing out polite questions instead of tossing out insults.