Timecodes don't match from same clip?!

I'm trying to relink audio to a clip that I added to the timeline but deleted the audio track. But when I double click on the clip on the timeline copy the timecode and then load the original clip from the bin and paste the timecode. The times don't match. The two clips which are the same clip one just on the timeline with the audio unlinked, have different starting timecodes. I've attached a pic to show what I mean.