Unless the others are all clones of the same mother, they could each have slightly different preferences for nutes.
The nute companies spend good money determining how best to use their products for a typical plant, but you can also find grow notes for specific strains as some like a little more or a little less of certain things.
I just started an ACDC CBD plant and I've read that they like light nutes in veg. I'll probably have to learn that on my own, but it's good to have in the back of my mind if I see issues cropping up.