I know there are multiple files but I don't think those files are specific to just one VI job so even if you copied them from a backup you would overwrite other job changes. If it were me I would get everyone out of VI and copy the entire VI folder onto the working install (or another install of the same version) then use Job Export from the VI > MAIN menu to export the job you need to restore. Then put the live VI folder back on and import that job back in.
Side note Deleting a VI job is WAY to easy - you hit the delete button in job maintenance and the job is gone with no warning. So I try to use Job export to export all jobs every now and then so I have a backup. (especially at clients that have import jobs they run often)