Could .env and .env.example files differ in Laravel?

Question

I have some custom configuration variables that only my company uses for the app. We have a dependency and we have to have those env variables to work that class but other people doesn't need those variables since they are not using the class we are using. So I have 5 more key=>value pair in my production .env which are not in .env.example, is this logical? Are there any other place that I should hold custom key variables other than .env