The difference, at least in this example, is fundamental. The FW25 is a totally new concept, rather than a development of the FW24. That means that everything was up for grabs and the entire shape and structure of the car has been re-thought. It is shorter, lighter, has a different engine and transmission - I wish I knew enough of the details to tell!
The McLaren, as far as I know, is just about as radical a development of the car as could be imagined - but it is still the same car underneath, kind of. The chassis is the same, the basic dimensions are the same... but they have re-worked loads of stuff, including engine, transmission, suspension.
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