They are not the same as the composition of the phosphor coating is different. Though the gas inside the tube emits UV light, the use of phosphor blends (it's a closely guarded recipe) coating the inner tube absorbs the UV and emits light (fluorese) in a color spectrum that sometimes is printed on the package.
When it comes to niche market/speciality lights, they will cost more $$$ than "mass market" lights.
Hope that clears things up.
Wilson
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