Passive Line-in Passthrough Possible ???

Is it possible to make a stereo line-in pass through by simply wiring the line-in jack to another jack via 10K (or other value) resistors ? Is there an electrical difference between a "pass through" and a "line-out" ?

I really do not want to go active, like buffering the signal with TL072s, unless passive really won't work.

Any advice would be appreciated!