The foundations in query are the next (emphasis mine):
903.4a Coloration identification is established earlier than the sport begins.
903.4b If a commander has a static means that causes a participant to decide on its shade earlier than the sport begins, that alternative applies throughout deck development and all through the sport, even because the commander modifications zones. That alternative impacts the commander’s shade identification. The participant reveals that alternative as they put their commander into the command zone earlier than the sport begins. See guidelines 103.2c and 607.2p.
So, it isn’t the case that the power enables you to choose an arbitrary shade earlier than every sport however reasonably the colour you selected for that commander is established as a part of making the deck record.
These skills are totally different from shade altering results in sport as a result of shade identification is established “earlier than the sport begins”, i.e. throughout deck development and is not modified after that. On account of this, the selection of shade for Faceless One will have an effect on the kinds of mana that may be produced by Command Tower whereas utilizing Prismatic Lace on a commander is not going to.
