Not a "pro" by all means, but...
IF you get invited to another interview, you best tell you failed. They WILL look at your records (thanks Clinton, and AMR) Flame on!!
However, I would TEND to believe systems would be a worse thing than SIM or OE. Hate to sound like "Simon", but that's my opinion. You can't pass systems, and if the new company flys the same equipment.. Or even if they don't, systems seem to be similar (in a way).
Just my way of thinking. But, it is by far NOT the end of the world.