Apple already has different model identifiers and different model names for their MacBook Pros. That's because they don't sell only one version of each laptop; they usually offer two or three versions that have different processors and different amounts of RAM. There were 6 different model numbers and 9 different configurations (across two different sizes and two different batches) of the MacBook Pro sold in 2013 alone:
I'm not suggesting that they advertise the MacBook Pros by their model numbers. My point is that they already have to differentiate between different models and different configurations, so it would not be difficult for them to make the model numbers different (it could be simple as one letter or digit change at the end) when they change such a significant part component.
http://support.apple.com/kb/HT4132
I'm not suggesting that they advertise the MacBook Pros by their model numbers. My point is that they already have to differentiate between different models and different configurations, so it would not be difficult for them to make the model numbers different (it could be simple as one letter or digit change at the end) when they change such a significant part component.