Clobetasol - what is the difference between OLUX-E and OLUX?

They both contain the same active ingredient but each is approved for a slightly different purpose so has a different criteria for use.
Olux - is approved for short‐term topical treatment of inflammatory and  
pruritic manifestations of corticosteroid‐responsive dermatoses of the
scalp and short term treatment of mild to moderate plaque‐type
psoriasis on non‐scalp regions
Olux‐E - is approved for short‐term topical treatment of inflammatory and  
pruritic manifestations of corticosteroid‐responsive dermatoses.