Having bought Jet A1 from the local airport on numerous occasions, I don't think they are the same end product although domestic kero may be the base stock for the Jet.
The stuff I know to be Jet fuel is very different stuff to the kero you get in bottles. The most noticeable thing is the additives of jet fuel, which I believe to be mainly anti freeze, that is left on funnels and anything you spill the jet onto. It leaves a substantial powdery deposit when it dries and it tends to burn the skin if left in contact. I know the guys at the fuel depot at the airport don't like filling the drums for this reason.
Avgas they don't care about, when you ask for Jet they start donning the PPE like they are filming a safety instruction Video.
They may pull the domestic kero off the line before they add the jet additives which would be logical but it's certainly not as far as I can see anything like the same end product.
I have priced Kero from Chemical Companies and even managed to find a servo still selling it but they wanted about $1 a litre more than I could get the Avgas for last time I checked. Since then I just go to the airport with the metal jerry cans they insist on and tell them it's for parts washing. They won't sell it to you if you say you are going to use it in a vehicle due to not being taxed.
I remember when I was a kid that kero was everywhere. The only reason a servo wouldn't have it at the pump was if they had ran out and were waiting on more. I used to go with my grandfather to buy it in all sorts of drums and funny styled but purpose made containers. He had pressure stoves, blow lamps, heaters and even a fridge at the onsite Caravan at Kiama that ran on it.
He had this Home remedy concoction he used to make up which consisted of Kero, Cleaned lard and I think Epsom salts. It ended up like a paste he used to Bottle as a topical ointment for everything from cracked heals to the black Plague.
It must have done some thing, I remember many Neighbours and friends constantly coming and asking if he had any to spare and bring contributions of lard for the next batch. My grandmother would keep a close eye on stocks and put away a good supply of her own as running out of it was something she didn't want to contemplate. The kero smell was very strong and once he added some scent to it but all the oldies reckoned it wasn't as good without the kero smell.
He'd have had a heart attack and died if he hadn't already if he saw kero at the supermarket for upwards of $5 a litre.
Probably didn't pay that much for a boot full of it when I went with him to get it.
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