Not necessarily. Physics is a more demanding subject than Engineering and requires lots of math applications and skills in the new syllabus. As I said above, scaling is pretty similar. If you like maths (e.g. and are planning to do a high level of it), Physics may be more for you BUT considering how you are planning Engineering as a second option, I would say that if you want an extra edge in uni, I would recommend Engineering.
Also, if it isn't any problem, may I ask what subjects you're thinking of doing? If you like, I can give you some tips if you are comfortable with doing so.