The standards required for a B.Eng engineering degree are defined in the Washington accord. An international standard where courses are accredited and assessed frequently. What does vary considerably around the world is the scope of coverage and the level of detail taught in specialised subjects when the children are in their final 2 years before university.
The UK specialises children at age 16. I spent 2 years studying maths, chemistry and physics - full time. Nothing else. as a result the specialist subject knowledge for the entrants at university in the UK is considerably above those that i would expect from an 18 year old in New Zealand, where even in their final year at school, they are still studying across a wide range of subjects.