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

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