Can I add JIRA servicedesk to the same configuration after I installed JIRA Agile ?
Yes.
(That's a really easy answer, but there's not a lot more to say. The addons co-exist fine, although you might have some issues with your desired processes if you try to do Agile on Service Desk projects. Nothing insurmountable, but it can be a little confusing sometimes)
Here's a screenshot of my local instance. As you can see, JIRA can be stacked with Agile, Service Desk, and Portfolio
Screen Shot 2015-06-15 at 10.24.05 PM.png
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