score:0

you can simply set a max for the y axes. e.g.

var maxy = 100;

....

scales: {
    yaxes: [{
        id: 'a',
        type: 'linear',
        ticks: {
            .....
            max: maxy
        },
    }]
    ....
}

here the snippet:

https://jsfiddle.net/lx9unv47/

also if you don't want to set the max of the y axes manually you can do this:

var allvalues = data.datasets[0].data.concat(data2.datasets[0].data);
var maxy = math.max(...allvalues);

and here the fiddle: https://jsfiddle.net/r6jglmns/

score:0

you can set the width of the axis to be the same on both graphs

  scales: {
      yaxes: [
        {
          id: 'y-axis-1',
          afterupdate: function(scale) {
            scale.width = 100 // set this value to be the same on both graphs
          },
        },
      ],
  }

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