yes it is. You will have to look at teh generated source and find each of the widgets, but you will see something like this
HTML Code:
<div id="tag_cloud-3" class="widget widget_tag_cloud"><div class="widget-title"><h3>Tags</h3></div><div></div>
</div> <div id="recent-posts-3" class="widget widget_recent_entries"> <div class="widget-title"><h3>recent posts</h3></div> <ul>
<li><a href="http://192.168.48.99/~paul/zenofmud/?p=74" title="block quote test">block quote test </a></li>
<li><a href="http://192.168.48.99/~paul/zenofmud/?p=72" title="a Map from Google">a Map from Google </a></li>
<li><a href="http://192.168.48.99/~paul/zenofmud/?p=29" title="new sticky">new sticky </a></li>
<li><a href="http://192.168.48.99/~paul/zenofmud/?p=27" title="Post with thumbnail and image">Post with thumbnail and image </a></li>
<li><a href="http://192.168.48.99/~paul/zenofmud/?p=26" title="Post with just image">Post with just image </a></li>
</ul>
</div>
here there are two widgets and both have a unique ID ("tag_cloud-3" and "recent-posts-3")
ou can use this ID as part of the CSS Selector