Ignore it - pheno characteristic. Strains will show different genetic traits , even from the same seed batch. Sometimes so called sativa dom strains end up more indica. With all of the strain crosses , reverse crossing and such gives different results.
I popped a Papaya strain ( 2 ) same seed batch ... Ended up with to different looking plants. It looks like a purp characteristic either from temps , enviroment or latent genetics.
You are already into week 7 ( i believe you said ) , begin the water only schedule at or near final weeks. If you see at least .... Some milkiness in the trichs it means they are getting ripe. Some of your leaves will turn color , regardless and does not mean deficiency. You are getting into the last stretch , so there is NO REASON to try to add new feed or supplemental products. The flowers will swell and mature still
UNTIL you feel its time to chop. It comes down to pulling the plug at the RIGHT MOMENT.
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