Yhup! Like he said. While you're in there hit em both up. It only costs a bit more to replace the slug while you're in there. Saves you digging back in and costing more in time and gaskets later down the track. I went with the Wossner forged piston and rings in my 300.
If you haven't done anything to the squish/gasket stack now is the time to take some measurements. You'll want the top of the piston flush with the bottom of the exhaust port at BDC for best port timing. Softer bottom and more revs up top. You then want to bring the squish down to somewhere between 1.3 - 1.8mm. Smaller is more performance orientated.
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