Question [Q] U.S.Cellular SIII to straighttalk

Another noob baptismal ... Here goes ,,, I.may soon be the recipient of a Samsung Galaxy S3 U.S. cellular (SCH-R530) ... Of course its locked and I will also be repairing the screen it looks like.

Currently, I have an SCH-720C (Samsung Proclaim) bought from StraightTalk and running on Verizon towers, completely stock. Since both are CDMA units, will it be possible to unlock the S3 and find a way to use that phone on my straighttalk account?

If so, what will be required? Can I plug and play using the Straighttalk sim?

Thanks for the warm welcome.