Hello Anuj,
Yes you can use emwin on the K70. Please refer the following link to learn more about the license that we provide for the NXP microcontrollers.
If you have not made the change yet to the K70, I highly recommend you to check the LPC54628 MCU to replace your K22 instead of the K70. K70 is an old MCU, on the other hand LPC54628 is one of our newest microcontrollers. The LPC also has an LCD controller and the advantage is that this MCU has SDK which includes multiple examples of the emwin library. A good idea will be to get the development board for the LPC54628, to see if the LPC fits to your project.
Link to the LPC54628 page.
Link to the development board for the LPC54628.
Hope it helps!
Victor.
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