"I tried baked beans from Tesco, Asda, Aldi, M&S and others - and I'll never buy Heinz again"

[dutchman]

https://www.birminghammail.co.uk/whats-on/food-drink-news/tried-baked-beans-tesco-asda-23009571

Actually she will as they're all made by Heinz!

My sister told me when she worked as a supervisor at the Co-Op.

They all arrive from the same factory on the same lorry and the only difference is the tomato sauce which is altered slightly to distinguish one brand from another.

[rebbonk]

From memory, the beans themselves are tasteless, it's the sauce that gives the flavour. So I suspect your sister is correct, Dutchman.