Yes, your data remains available even if you switch to a different license model. You don't have to worry.
<% if (previousArticle) { %>
<% } %>
<% if (allItems.length > 1) { %>
<% if (previousTitle) { %>
<% } %>
<% if (nextArticle) { %>
<%= previousTitle %>
<% } %> <%= previousArticle.title %>
<% if (nextTitle) { %>
<% } %>
<%= heading %>