Item bought from eBay different brand supplied but brand owned by same company has seller broke trading standards rules?

I bought an anti-roll bar from a well known car parts shop that trades on eBay and also has high street shops as well.

On the eBay listing the shop listed that it was supplying a "Lemforder" anti-roll bar. Upon receipt of the item I notice it s actually a TRW anti-roll bar.

I went onto TRW s website and it seems that both TRW and Lemforder are owned by ZF.

I m wondering even though these two parts are made by the same company just with different brand names on them have they broke trading standards rules by supplying the wrong brand - I assume the quality of the parts might be the same unless of course TRW is the budget brand of Lemforder which could even bring into question whether or not the parts are in fact of the same quality I was expecting or not.