Tom,
I also have the LV 6.0.3. RT and just checked for the Compare VIs function, and it is right where your comments above say it should be (at least on my load of LV). Of course that doesn't help you, but I feel better 🐵
If its still not on yours, you may need to get with NI for suggestions.
Sorry for the lack of a quick-fix...good luck anyway, Doug