NPK is NPK, humans just extracts it and bottles it to makes the money!
I can tell not 1 bit of difference between organic dope and salts grown dope, apart from growing in coco is less headache than soil.
As for EC, no need for it. Just feed the plant according to what colour it is and what stage of life it's at.
Per litre of water... 1ml of A+B for veg, up that to 2ml week before flip for 3 weeks, then drop back down to 1ml and start adding a bit of PK if you so fancy.
Other folks have their own recipes, I like to keep it simple and I had forgotten how simple the coir can be.
Cheers TT.