Bulbophyllum lobbii var, Malacca, blooming with multiple flowers for the second time in 2014

In the past I had tried to grow this orchid without sucess.  In January of 2013, I received this plant and the nominate variety.  Both were treated identically, potted in the same media and in the same type of basket, they were growing side by side.  The nominate type died a low and messy death, the var. Malacca has thrived and blooms very well.  I wonder what is the difference that caused the different outcomes in the cultivation of plants that are essentially identical in their needs.