Compatibility of  ADUC7020 with 7028

Currently we are using Aduc7020 in our design.We are planning to change 7020 to 7028. As per datasheet internal architecture of both are same excluding the small difference in number of GPIOs. we are not using ADC& PWM portion of this processor.We want to confirm that the existing code can be reuse in ADUC7028 incorporating changes in pin  muxing.