Is This Right In System Profiler??

[b-rad g]

I am a new Mac owner and still wandering around in OSX, but I have a question. In System Profiler>Software>Applications, every application has 2 listings. Some have what looks to be a previous and new version, and some have both listed as the same version. Is this right? Why is this?

 

[spinnerlys]

Compare the locations of each double entry:

 

[b-rad g]

Compare the locations of each double entry:

I see what its doing.....one location is on the system and the other is on the partition of my external hd that is for my super duper clone. Thanks!