2nd autoflower 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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I would chalk it off to autos having occasional flukes. Recently the 4th grow of a strain took *much* longer to to show sex and flower. I thought I would have to help it by switching to 12/12.