$array = array("a|12","b|43","a|33","b|767","","a|565");

$arrayiki = array("12|a","43|b","33|a","767|b","","565|a");  

$a = array();

$b = array();


foreach($array as $oge){
   $bol = explode("|",$oge);
   if($bol[0] == "a"){
     $a[] = $bol[1];
   }else if($bol[0] == "b"){
   $b[] = $bol[1];
   }
  
}

foreach($arrayiki as $oge){
   $bol = explode("|",$oge);
   if($bol[1] == "a"){
     $a[] = $bol[0];
   }else if($bol[1] == "b"){
   $b[] = $bol[0];
   }
  
}

sort($a);
sort($b);
echo "<h1> a </h1>";

foreach($a as $oge){
   
echo $oge . "<br>";

}


echo "<h1> b </h1>";

foreach($b as $oge){
   
echo $oge . "<br>";

}