Is the online almanac the same as that taken by Yin and Yang teachers?

It's different. The traditional lunar calendar is usually published in paper, which contains not only the daily information of the lunar calendar, such as taboos, auspicious times, auspicious colors, washing and so on. Online almanac also provides other functions, such as weather forecast and constellation. So the online almanac is different from the almanac taken by Yin and Yang.