We are currently using 4.3 esri api version in our application and we want to use certain functionalities that 4.18 offers. But when request certain services from 4.18 we get an error. If we remove the line of code "<script src="https://js.arcgis.com/4.3/"></script>" it works fine.
How can we have both version running together?
Here is a link to our code. https://jsfiddle.net/dx57pyk9/6/