private boolean canInPlaceResize() {
        return canInPlaceResize(from.nodes(), from.advertisedResources().nodeResources(),
                                to.nodes(), to.advertisedResources().nodeResources(),
                                model.clusterSpec().type(), model.isExclusive(), from.groups() != to.groups());
    }
Returns true if the *existing* nodes of this needs to be replaced in this change.
node-repository/src/main/java/com/yahoo/vespa/hosted/provision/autoscale/ResourceChange.java