ZonedDateTime and OffsetDateTime

What is the output of the last line of this code?

ZoneId yerevanZone = ZoneId.of("Asia/Yerevan");
ZoneId londonZone = ZoneId.of("Europe/London");

LocalDateTime localDateTime = LocalDateTime.of(1991, 4, 15, 18, 00);
ZonedDateTime londonZonedDateTime = ZonedDateTime.of(localDateTime, londonZone);

System.out.println(londonZonedDateTime); // 1991-04-15T18:00+01:00[Europe/London]
System.out.println(ZoneOffset.from(localDateTime.atZone(yerevanZone))); // +04:00
System.out.println(londonZonedDateTime.withZoneSameLocal(yerevanZone));