iMac 27" Late 2012 screen replacements OEM or Third party

Hi, i got a iMac 27 inch late 2012 and begin to have ghosting issues so i take it back to the warranty.

In my country there isn't an apple retail store but authorized resellers.

They say they will replace the screen and already place the order to "apple" the say..

but how can i be shure they will replace it with the original OEM screen and not with a third party one that has worse image quality?

Is there any third party replacement? Because all that i have found from china has the LG Display logo on.

The screen number is LG LM270WQ1 (SD) (F1) right?

Any ideas?

Thanks!