Yes, the EA's have only three rows of LED's; the DA's are more expensive, but they have five (but it's less expensive to buy two 36" DA's than one 72"). I have EA's on my shallow tanks (bottom row in the pic), but DA's on everything 18" deep and over (top row)-
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You will note that both the DA's and EA's come in two different versions- the 'Full Spectrum' version contains a few red and green LED's in addition to the white and actinic LED's; this seems to be the EA that you ordered. I have one of these on the 75g show tank in my living room. All of the tanks in my fish room have the '6500K' version, irrespective of whether they are DA's or EA's, which contains only white (6500K) and actinic LED's. I prefer these, but it's just a matter of personal preference. I don't know why BeamsWork makes their nomenclature so complicated.