ashkastoBoth of these models have 1440p & 144hz.
Optix MAG27CQ - 27" w/Red LED Lighting & 1440p WQHD Res (+ $160)
Optix MPG27CQ - 27" w/RGB LED Lighting & 1440p WQHD Res (+ $225)
They do not have G-Sync they both have FreeSync. If they did have G-Sync they would be about $300 more in price.
Optix MAG27CQ - 27" w/Red LED Lighting & 1440p WQHD Res (+ $160) Optix MPG27CQ - 27" w/RGB LED Lighting & 1440p WQHD Res (+ $225)
They do not have G-Sync they both have FreeSync. If they did have G-Sync they would be about $300 more in price.
Edit: Looked them up and it would seem so.