MPI vs. Complete Milk Dairy Isolate

Does anyone know what the difference is between these two is? I read a description but I still don’t understand, they are both 80/20 casein to whey. I’m wondering if its worth the extra money to get the complete MDI instead of the MPI. Thanks

difference is in process and in price

Well I know the price is different, I’m wondering why…and if there is a difference in quality.