If you want to use this or such a watch, you should at least state your year of birth, weight, height and sex. Other values are measured or estimated. In this way, the watch becomes more accurate over time, e.g. if it knows your stride length and so on. Unfortunately, you cannot store two profiles and simply select them. That would be too much for such a mini-computer and would certainly only be used by a few, because many people always wear it (activity measurement, smartwatch functions, etc.).
So in short: 1. yes, 2. no