I have seen the phrase "of a different piece" used to compare two related but differnt ideas. For example:
"Candidate X's criticism of the financial bailout was of a different piece. Unlike Candidate Z, who opposes the bailout because it does not put enough money into the system, Candidate X opposes the plan because it is provides too much to those who do not need it."
Questions: is this a correct use of the phrase "of a differnt piece" and does anyone have any widely published examples of this usage?