There are no differences between the two, they are exactly same. It is because Git has many high level commands which actually calls other low level commands.
Lets say you have executed any one of the below commads, both this command will actually clone your repository.
git svn clone "Your URL"
git svn init "Your URL"
git svn fetch
The first command is a high level command which includes initiating a repository and then fetching commits from an SVN repository and the second command is doing the same thing but using two separate low level commands.
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