There is a big difference in general purpose NPK fertilizer and the one specially designed for Hydroponics. The N(Nitrogen) in NPK fertilizer mostly comes from Urea or Ammoniacal form. It is designed to decompose with time and release nitrite which is later converted to nitrate by bacteria. Thus it is more suitable for use in soil.
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Plants readily absorb Nitrogen in Nitrate form and hence Hydroponic formula use Calcium Nitrate or Potassium Nitrate as a source of Nitrogen. The point here is, Hydroponics system requires Nitrogen to be in Nitrate form and hence require different type of fertilizer.
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What you can do is, use MasterBlend (4:18:38) as your NPK fertilizer and equal weight of Calcium Nitrate and Half of that Magnesium Sulfate as a simplest formula. Note here that this relies on Calcium Nitrate for supplying Nitrogen. For Trace elements, you can use one of the ready mix available in the market.
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