[Solved]-Different ToolTip text For Links and Nodes in Highcharts Sankey Charts-Highcharts

you can use pointformatter and nodeformatter functions:

series: [{
    ...,
    tooltip: {
        nodeformatter: function() {
            return 'some text for node'
        },
        pointformatter: function() {
            return 'some text for link'
        }
    }
}]

live demo: https://jsfiddle.net/blacklabel/romtnqx5/

api reference:

https://api.highcharts.com/highcharts/series.sankey.tooltip.pointformatter

https://api.highcharts.com/highcharts/series.sankey.tooltip.nodeformatter