Hi,
It's probably easier to [https://www.youtube.com/watch?v=TVJN4FYk2t8|replace] the [https://www.ebay.com/itm/203255747147|charge port board] than to try and find the correct headphone socket for the phone and then to remove the old socket from the board and replace it with the new one.
The part supplier link is an example only to show what it may cost. There are other suppliers online. Just search for ''Galaxy A12 charge port board'' to get results for suppliers that suit you best.