How do I tell if a pacifier is silicone or latex?

My son uses a pacifier- Playtex Ortho-Pro to fall asleep while in daycare. The pacifier came in a baby kit that I was given, and honestly- I didn't look at the packaging & would like to get him a few more just incase. How do I tell if it's the latex or the silicone one? I looked at the pictures online, but both the latex & silicone seem to have one clear nipple & one brown nipple in the package (maybe they are just using the same picture?). I've already spent at least 40 bucks on different types of pacifiers & since he has found one he likes- I'd like to make sure it's exactly the same. I don't want to spend more money, as he only uses it for 2 minutes 3-4 times a day to fall asleep at daycare & doesn't use it at home at all.