It is likely a specific clone or individual of the Encyclia mapuerae species that has been assigned a unique identification number. The "4N" designation could indicate that it is a tetraploid variety, meaning it has four sets of chromosomes instead of the typical two.
Tetraploid varieties can sometimes exhibit different characteristics compared to their diploid counterparts, such as larger flowers or more robust growth. If you're cultivating this particular clone, it's important to follow general care guidelines for Encyclia mapuerae while also considering any specific care instructions provided by the source from which you obtained the plant. This may include factors like light, temperature, humidity, and watering preferences.