The 2009 works even better on CNG with more power and automatic also works on CNG with higher fuel economy.
2009 City has better road grip, better engine, better interior room front and rear and AC performance, better suspensions and even bigger trunk.
The only downgrade is the interior quality if you can live up with it.
A good car 2009 City M/T would cost you around 1.1M and Auto 1.2M PKR.