All the suppliers I've use are (or were) based around Manchester, so they probably all have a common source.

The original supplier was Manchester Guitar Tech https://manchesterguitartech.co.uk/

Then Rothko and Frost joined in https://www.rothkoandfrost.com/guita...pray-paint-c34
as did Northwest Guitars https://www.northwestguitars.co.uk/n...lose-aerosols/ and also ToneTech Luthiers https://tonetechluthiersupplies.co.u...-lacquers.html

I can't say I've noticed any difference in the products, and I generally buy by stock availability and whether they have other things I also need to ensure free shipping.