What is the difference between cocamidopropyl betaine and lauryl propyl betaine

How is cocamidopropyl betaine different from lauryl propyl betaine? Cocamidopropyl betaine and lauryl propyl betaine, although they are both betaine, but there are still differences: Cocamidopropyl betaine is if it is done from coconut oil, then there is a by-product glycerin, if it is started with cocoic acid, there is no by-product glycerin, from the synthesis, coconut oil (or cocoic acid) and dimethylpropylene diamine are required to first synthesize intermediates, in the synthesis of betaine
with C2H3O2Cl 。 Coconut oil and cocoic acid, also saturated or not (that is, hardening, the unsaturated bond is hydrogenated into a saturated compound), from the carbon chain distribution, containing C8, C10, C14, C16 and C18 and other fatty acids, of which C12, C14 is the mainstay
.
This type of betaine, commonly known on the market as CAB lauryl propyl betaine is a synthetic betaine synthesized directly from dodecyldimethyl tertiary amine with C2H3O2Cl, commonly known as BS-12 on the market; And in terms of carbon chain distribution, although it is lauryl propyl betaine, it is actually a mixture
of dodecyl.
In addition to the above differences, there are differences in the irritation of the skin between the two, and there are also differences
when applied.