What is the difference in quality of a 1080p WEB-DL and a 1080p WEBRip

I am asking this in reference to stranger things season 2 release by Ntb. The first upload was 1080p webdl where the entire season was 12.1 GB. Now there are also 1080p webrip uploads by Ntb where s02e01 itself is somewhere about 5 GB