Nope they are just different phenos same plant different parents or just unstable like most strains. Wait tell they show you their stuff.so whats the deal with one plant growing so quickly than the other ? coz its male?> the seeds both germed and were started from the same plant at the same time.
you can...I would leave them if they still have some green left, but isn't a big deal either way..imoshould i cut the yellow leaves off?