Can you freeze the track/s then copy the 4 bars then paste them over the other bars.
You can also save the track as performance track then move that track to the Audio track where you can copy and paste bars with the snap enabled.

Right click track name at the top > Track Actions > Save As Performance.
Audio menu > Move Performance track to Audio.
Audio Edit > check Snap > copy 4 bar paste over other bars.
You can move the Audio track back to Performance after.