Any "name brand" spokes will be stamped with the trademark on the heads.

The flange spacing and diameter (hole circle) are important for building the wheel. Even the hole size may make a slight difference, at least it is included in the spoke calcs.

OLD is important for the hub to fit into your dropouts. 100mm is the most common for front wheels, although you may encouter some variability with MTBs, fat bikes, tandems, or certain older bikes.