I don't see why it would matter if you're registered under Earth Sc 1G03 or Envir Sc 1G03 for any of the programs. Unless they use that to defer between students who take the course as an elective and as a prereq for the program...Now you have me doubting myself. lol
Feel free to contact the Department if you're really that unsure - and if they say it's not the same please let me know. lol
You could email Luc Bernier:
http://www.science.mcmaster. ca/geo..._us/index.html
Or just ask an academic advisor.