Question about 18.5" 2014 or older water pan

I have a Cajun Bandit stacker for my 2014 22.5" WSM, & I also have a 22.5" kettle. I wonder if someone can measure their 18.5" water pan where it fits the brackets that hold it in place. I would need the outside diameter at the top of the water pan. I do not know if the older water pans are larger or smaller in diameter, but I would bet they are the same. My Cajun Bandit dimension in that area is 18". If the 18.5" water pan is smaller than that, I will use one in my 22.5" Cajun Bandit.

Thanks in advance!