I am using a multifunction DAQ card and a analog out card. I have had no problems using the MCC Labview drivers, but there was a bug in build 550a when using the NI Labview drivers with the MCC boards. There was a memory leak, and I was told that it would be fixed in the next build. I have not checked to see if that is true yet.
I can't say if there is a one-one relationship with the connector, but logicially and electrically, I was able to use the MCC DAQ card the same way I was using an NI card.
In conclusion, using the card with the MCC Labview functions is safe and stable, but I can't say that you can use them reliably with the NI DAQ functions. I have always heard from other users that the hardware is as good as the NI products, and I have had no problems with that. Tech support is decent, also.