Variable speed vs. 3 speed wipers

Well, I was incorrect. I only have a 2 speed and a 3 speed switch.
Now another question. I have a Chrysler interchange book. The part number for the variable speed switch (apparently no 3 speed option that year) is not the same part number as the one I have. According to the interchange book, the switch I have is for a Challenger. It appears that the terminals are the same, so I can assume this switch will work?