<?php
$cuerpoOri[] = array("serie"=>"57101001312245488", "costo"=>2000);
$cuerpoOri[] = array("serie"=>"57101001312245487", "costo"=>1000);
             
$cuerpo[] = array("serie"=>"57101001312245487", "costo"=>2000);
$cuerpo[] = array("serie"=>"57101001312245488", "costo"=>5000);

foreach ($cuerpoOri as $c1){
	foreach ($cuerpo as $c2){
		if (in_array($c2["serie"], $c1)){
			echo "Serie de 'cuerpo' encontrada en 'cuerpoOri': " . $c2["serie"] . "\n";
			echo "Costo de 'cuerpo': " . $c2["costo"] . "\n";
			echo "Costo de 'cuerpoOri': " . $c1["costo"] . "\n\n";
		}
	}
}