In theory, you should go with the matched to ensure you have even coloration across both channels. In practice, I doubt you'd ever notice if you went with the unmatched pair. I ran an unmatched pair of the older version TL's and I never noticed a difference in sound between the 2 mics. When the new version came out with Larry claiming they sounded even better, I went with a matched pair because I'm the type of guy who thinks too hard about stupid details like matching (stupid considering what we are taping, I mean are the PA's channels "matched"?).
What are you planning to run behind the TL's?
Craig.