Yes the packages in both CY8C61 and CY8C62 are pin compatible.
Yes, you can use different supplies to power different IO banks as long as the supply is within the device operating voltage range (1.7 to 3.6 V). Please refer to the datasheet or TRM for details on which VDD rail powers which IO ports.
Meenakshi Sundaram R
Thanks for your answer.
Unfortunately there is no information of availability and pricing for PSoC62 devices on Cypress website. Do you know when these chips will be released (especially CY8C6247BZI-D34) ?