../ in a path means one level up from the current folder. So your first path is a relative path, and the second one is an absolute path. Besides, those are pointing to 2 different file-names (filename.svg and filename.9f72c13b.svg). First, you need to figure out to which file you want to refer, and then make sure it's present in that your specified location.
Is there a way to change all of the first paths to be like the second?
Yes, you can just use a simple text-replacing feature of your text-editor, say for example notepad++ which can do replace text with regular expressions and in multiple files simultaneously.
A note about the 'current directory': it's a bad idea to rely on assumptions about it, because on some platforms it may not be what you want, or it may even change from version to version.