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HTML 

              
                <div>
  <button id="sort1">Sort by Country</button>
  <button id="sort2">Sort by Median income (US$, PPP)[3]</button>
  <button id="sort3">Sort by mean PPP USD 2013</button>
  <button id="sort4">Sort both independently</button>
</div>
<svg id="one" width="400" height="600"></svg>
<svg id="two" width="400" height="600"></svg>
!

CSS 

              
                .rivela .background{
  fill:white;
}
.rivela .item.selected rect{
  fill:orange!important;
}
!

JS 

              
                var chartGen = rivela.barchart()
    .width(400).height(600)
    .key(d => d.Country)
    .horizontal(true)
    .margin({left: 100})
    .axisx(d3.axisBottom().tickFormat(d3.format('.0s')).ticks(5))

var originalDataset

d3.csv('https://fabiofranchino.com/disk/datasets/country-median-mean.csv', data => {
  originalDataset = data
  update(data, data)
})

function update (data1, data2) {
  chartGen.value(d => d['Median income (US$, PPP)[3]'])
    .colors('#BE1E2E')
    .title('Median income (US$, PPP)[3]')

  d3.select('#one')
        .datum(data1)
        .call(chartGen)
        .on('over', function () {
          var e = d3.event.detail
          selectSameFromOne(e)
        })

  chartGen
    .value(d => d['mean PPP USD 2013'])
    .colors('#C6D8E4')
    .title('mean PPP USD 2013')

  d3.select('#two')
        .datum(data2)
        .call(chartGen)
        .on('over', function () {
          var e = d3.event.detail
          selectSameFromTwo(e)
        })
}

function selectSameFromOne (dat) {
  var index1 = dat.index
  var index2
  var data2 = d3.select('#two').datum()
  data2.forEach((d, i) => {
    if (d.Country === dat.datum.Country) index2 = i
  })
  selectSame(index1, index2)
}

function selectSameFromTwo (dat) {
  var index2 = dat.index
  var index1
  var data1 = d3.select('#one').datum()
  data1.forEach((d, i) => {
    if (d.Country === dat.datum.Country) index1 = i
  })
  selectSame(index1, index2)
}

function selectSame (id1, id2) {
  console.log(id1, id2)
  d3.select('#one').selectAll('.item')
    .classed('selected', (d, i) => i === id1)
  d3.select('#two').selectAll('.item')
    .classed('selected', (d, i) => i === id2)
}

d3.selectAll('button')
    .on('click', function () {
      var id = d3.select(this).attr('id')

      var k = ''

      if (id === 'sort1') k = 'Country'
      if (id === 'sort2') k = 'Median income (US$, PPP)[3]'
      if (id === 'sort3') k = 'mean PPP USD 2013'

      var ndata1 = originalDataset.sort((a, b) => d3.descending(a[k], b[k]))
      var ndata2 = ndata1

      if (id === 'sort4') {
        var copy = originalDataset.map(d => d)
        ndata1 = copy.sort((a, b) => d3.descending(a['Median income (US$, PPP)[3]'], b['Median income (US$, PPP)[3]']))
        ndata2 = originalDataset.sort((a, b) => d3.descending(a['mean PPP USD 2013'], b['mean PPP USD 2013']))
      }

      update(ndata1, ndata2)
    })
!
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