sort -t'|' -k 1,1 File1 File2|awk -F\| 'BEGIN{i=0}{
                              pat=$1"|"$2
                              ocurrences[pat]++
                              line[i]=$0
                              i++
       }
       END {
          for (j=0;j<i;j++)
              {
              pat=substr(line[j],1,5)
              if (ocurrences[pat]>1)
                print line[j]>>"File3"
              else
                print line[j]>>"File4"
              }
      }'

sort -t\| -k1,2 file1 file2|awk '{
	x[$1,$2]++
	y[NR] = $0
} END {
	for (i = 1; i <= NR; i++)
		print y[i] > ((x[substr(y[i],1,5)] > 1) ? "file3" : "file4")
}' SUBSEP="|" FS="|"

sort -t\| -k1,2 file1 file2|awk '{
	x[$1,$2]++
	y[NR] = $0
} END {
	for (i = 1; i <= NR; i++)
		{
			tmp = y[i]
			split(tmp,z)
			print tmp > ((x[z[1],z[2]] > 1) ? "file3" : "file4")
	}
}' SUBSEP="|" FS="|"