public static int compareValueHashCode(final ByteBuffer thisBuffer, final ByteBuffer thatBuffer) {
        try {
            return ByteBufferUtils.compareTo(
                    thisBuffer, VALUE_HASH_CODE_OFFSET, VALUE_HASH_CODE_BYTES,
                    thatBuffer, VALUE_HASH_CODE_OFFSET, VALUE_HASH_CODE_BYTES);
        } catch (Exception e) {
            throw new RuntimeException(LogUtil.message("Error comparing [{}] & [{}]",
                    ByteBufferUtils.byteBufferInfo(thisBuffer),
                    ByteBufferUtils.byteBufferInfo(thatBuffer)), e);
        }
    }
Compare the valueHashCode part of both byte buffers, comparing in byte form
stroom-pipeline/src/main/java/stroom/pipeline/refdata/store/offheapstore/serdes/ValueStoreKeySerde.java