Heat Stress or an Deficiency, help pics included

ok so i have these two plants Kandy Kush x Shunk and Pure Afghan and i have been wondering whats wrong with them there around six weeks old and about a week into flowering and they seem yellow someone told me it was heat stress but then someone else told me it was a deficiency so idk
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the one on the left is Pure Afghan and the one on the right is the Kandy Kush. Help Please

Ill go with heat stress too.

Pics 3 looks like the leafs touched something hot. A few old leaves dying is normal. Can you take a pic of your whole plant? It would help.

Looks like heat stress for sure. Light bleaching