Both are the same. Sansai blue has more coerulea blood in it so it's more easier to bloom and tolerate cooler temperature. It's flower color tend to be toward sky blue to true blue and flower are a little open and some clones has the typical coerulea twisting petals.
Pak Chong has more sanderianum shape, round and flat and most clone I had seen so far are more violet-blue color. Both are lovely and collection worthy.
V. tricolor can be grown under intermediate condition, and need higher light. Mokara going to need the highest light and heat because of the arachnis parent which are true tripical vanda type orchids, so put it toward closest to the window and CFL light. But it's also depends on how much Ascocenda blood in there compare to arachnis blood.
For extra humidity, you can put spanish moss inside the pot/basket. It retain moist for a few hours after watering, but not soaking wet like N.Z.Spr moss to cause rotting.
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