Castrol vs Quantum oil

[JayG90]

A dealership I've been too has tried to sell me quataum oil and said it's same as Castrol just rebranded. Done some searching and can't find anything... Have they tried flogging a cheaper oil but at a more pricey tag? 

[BOF]

Does it meet the appropriate Ford standards (there are probably some Quantum oils that do and some that don't)? Neither Ford-branded nor Castrol-branded oils to the -C and -D standards are particularly expensive, particularly if bought in bulk, so there probably isn't a big saving in it (even if my favourite is the Mobil Super 3000FE, which Halfords often have on offer).
 

[JayG90]

My question is  is quantum actually Castrol or not? As they've said it's the same brand.