The courses are the same. I was told that the difference is kinda up to you, if youre aiming for a minor in say, Enviro Sci, then choose that course code instead of Earth Sci.
If you have Bernier, hes very fair, you only need to learn whats in his slides, he tells you what to study and how much things will be worth on the exam, and the labs are easy marks. I got a 10 without too much stress