updating ports - tag needed?

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I read that only src uses a tag to define the revision desired when 
updating via cvs or cvsup. Distros such as ports, XF4, and www do not 
use release tags but instead follow current.

At the same time, I understand that using a different release from the 
system release that you are tracking can cause problems (e.g. running a 
-stable ports tree on a -current system.)

So, if I always track -stable for my system src tree, and ports tree is 
only distributed as -current, am I going to have problems if I update my 
ports?

TIA

DS