They typically use the same soap bases, but with slightly different ratios of ingredients. It really varies by manufacturer and you’ll find alot of variety in the preparation, ingredients, and concentration. It is definitely not dangerous to use body wash on your hair or vise versa. Back in the day people would just use soap bars to wash their hair until some marketing genius(can’t remember his name, someone please remind me) decided that people enjoyed washing themselves alot more once a foaming agent was added and thus modern shampoo was born.
(Disclaimer: I found this out from casual research a long time ago, their may be discrepancies so if anyone sees any please let me know! Hope this is helpful to someone!)
[Dr. Bronner](https://shop.drbronner.com/pure-castile-liquid-soap#scent=Lavender) says “One god, one soap” Dilute, dilute, Ok!!
“Good for just about any cleaning task. Face, body, hair & dishes, laundry, mopping, pets—clean your house and body with no synthetic preservatives, detergents or foaming agents—none! Dilute! Dilute! OK!!”
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