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var app = angular.module('myApp', ['ngGrid']);
app.controller('MyCtrl', function($scope) {
    $scope.option;
    $scope.myData = [{name: "Moroni", age: 50},
                 {name: "Tiancum", age: 43},
                 {name: "Jacob", age: 27},
                 {name: "Nephi", age: 29},
                 {name: "Enos", age: 34}];

    $scope.gridOptions1 = { data: 'myData',
                       columnDefs: [{ field:"name", displayName: "NAME"},
                                   { field:"age", displayName: "AGE"}],
                       multiSelect: true };

    $scope.gridOptions2 = { data: 'myData',
                       columnDefs: [{ field:"name", displayName: "Name"},
                                   { field:"age", displayName: "Age"}],
                       multiSelect: false };

});

<body ng-controller="MyCtrl">
    <label>Show me:</label>
    <input type="radio" name="option" ng-model="option" value="gridOptions1">Grid A</input>
    <input type="radio" name="option" ng-model="option" value="gridOptions2">Grid B</input>
    <div class="gridStyle" ng-grid="{{option}}"></div>
</body>

var app = angular.module('myApp', ['ngGrid']);
app.controller('MyCtrl', function($scope) {

    $scope.myData = [{name: "Moroni", age: 50},
                     {name: "Tiancum", age: 43},
                     {name: "Jacob", age: 27},
                     {name: "Nephi", age: 29},
                     {name: "Enos", age: 34}];

    $scope.columnDefs1 = [{ field:"name", displayName: "NAME"},
                                   { field:"age", displayName: "AGE"}];


    $scope.columnDefs2 = [{ field:"name", displayName: "Name"},
                                   { field:"age", displayName: "Age"}];


    $scope.gridOptions = { data: 'myData',
                       columnDefs: 'columnDefs1',
                       multiSelect: true };

    $scope.switchColumnDefs = function() {

        $scope.columnDefs1 = $scope.columnDefs2;


    }

});

<body ng-controller="MyCtrl">
        <label>Show me:</label>
        <a ng-click="switchColumnDefs()">Switch Options</a>
        <div class="gridStyle" ng-grid="gridOptions"></div>
    </body>

var gridOptions1 = {
    data: 'myData',
    columnDefs: [
        { field:"name", displayName: "NAME"},
        { field:"age", displayName: "AGE"}],
    multiSelect: true,
    selectedItems: $scope.selected
};

var gridOptions2 = {
    data: 'myData',
    columnDefs: [
        { field:"name", displayName: "Name"},
        { field:"age", displayName: "Age"}],
    multiSelect: false,
    selectedItems: $scope.selected
};

$scope.filterTabs = [{grid: gridOptions1}, {grid: gridOptions2}];

<ol>
    <li ng-repeat="tab in filterTabs">
        <div class="gridStyle" ng-grid="tab.grid"></div>
    </li>
</ol>

$gridScope.selectionProvider.multi = true / false;