Noticed this in the EK News section.

"The A380 will offer an additional 135 seats to San Francisco and 137 to Houston, representing a 38 percent increase in overall passenger capacity, and 80 percent more seats across the premium cabins. In addition to offering a choice of 14 First Class Private Suites and 76 lie-flat Business Class seats, the aircraft offers 399 spacious Economy Class seats to San Francisco and 401 to Houston."

Is this a slight variation in the configuration of the latest A380s and also dedicating specific aircraft to the Houston route?