First autoflower grow?????? WTF

This is my second autoflower..... I have the same good genetics.... I think. (good). This is northern lights autoflower by royal queen seeds... The obvious plant is 3 weeks older I harvest the main cola because I wanted to try some clear tricombs. The best looking plant will be full 65 days of flower on 8/25 . (expected finish ) both plants are same strain. I have feed both plants same nutes. I don't understand why one..... The youngest/biggest is looking incredible and the older plant is looking fake lol...... I will post all pics I have.... I'm growing in a extemly high perlite / soil mix.... Like 75% perlite. I have gave them alot of lightning..... The youngest/biggest plant I kept outdoors for one week and experience exceptional growth. But have put back inside due to really wet weather... Can someone explain why the plants are so different and any advice for me to get some super colas.... I have never topped either one. The youngest/biggest I obviously lst. So any comments or help would be appreciated..... Thanks and happy growing..
P.s. these pictures are of only 2 different plants taken all with last 2 weeks...... Some as recent as yesterday... Use common sense and you can tell witch plant is witch.

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The life!!!!

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Most recently..... Yesterday

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Well Reo they look great be patient NL auto's are one of the longer flowering auto's
and they can get quite large.
Keep up the good work, give low N and high P K nutes and they'll be happy girls.

they are so different
because of a variance in pheno's that shows in every hybrid pretty much
if it were to be farther stabilized it would be done at risk of losing some of its vigor

Just did a few pandora, one was purple, one was short and branchy, and another tall like a pine tree. As tec said their different pheno's. A seed grow is like a box of chocolate's, you never know what you'll get lol.