The both have an estore which earn avios.
They both have credit cards which earn avios.
They are both part of the Tesco reward scheme in which you can redeem for ...... Yes you guessed it. Avios.
There are small differences but why not merge the schemes. It's never a good idea to confuse your customers. Remember flyertalkers are hardly the majority of flyers.
Must be from the same person who came with the name "avios". If there was ever a meaningless marketing dept thought buzz word lol