How to make iMac running Os 10.7.5. like Mountain Lion ?

I have been using an up-to-date mountain lion on a MacBook Pro for some time.
Just purchased a secondhand iMac late 2006 running OS 10.7.5.
I had hoped to be able to download mountain lion onto this so that both worked in the same way.
However I checked with Apple technical support  who says this is not a good idea as it is not supported.
What does this mean and what would be the likely problems if I tried?

Here are Mountain Lions Tech Specs.
As you can see only iMacs from mid 2007 or newer can run it. Basically if you tried to install the OS on your iMac it will refuse to do it as the hardware can't support it.

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