I have 2 W-2.

One from job in Mass. Mass state tax is withheld in that W-2. Then I moved to NC and got a new job in NC. NC state tax is withheld in this second jobs W-2.

Both W-2 only have state tax withheld from their corresponding states. So can I credit taxes of one state to another and vice-versa ? I am planning to fill out Part Time resident forms for both states.

Thanks in advance

You CANNOT claim the credit for taxes paid on the other state in EITHER state tax return. The states contact each other and compare notes, so do NOT do it.