Looks like it could just be a bad phenotype. Its not very expressive of anything else, true nute curl generally curls the entire leaf, whereas on that its like they are just bent at the ends. Very odd. The leaves do not look terribly healthy on thte sick plant, nor really the healthy plant. What strain are these - bag seed? Bad seed will throw a bunch of junk phenos out there... if its a good strain you need to really look at your pH and soil. We need more information on this grow to help diagnose.
A picture says a thousand words, but if we do not know what context those thousand words are in - we can not help. Please, provide a narrative - what strain, what soil, ph, nutes, lights, temps...