no they are two different things. They each require a separate test. Burc is just tested by drawing blood and the lab tests it. The tb is more involved. You must dart or run them through a chute. You shave a patch of hair on their neck so the vet can make an injection. 72 hrs later the vet comes back out, you dart or run the deer back through the chute. The vet feels the injection area. If it is lumped up at all then they are "suspect". If no lump that deer is done. The deer that are suspect need to be ran back through the whole process again this time the vet checks for only bovine tb. Most of the time the animal that is suspect is due to having a form of avian tb. For the bovine test it is exactly the same except at the time of injection the state vet (they are required to do the retest) takes a caliper reading of the test site. After the same 72 hr wait the state vet comes back out and calipers the test site again. If the reading falls between a certain range the animal is ok and you are done. If it test in a certain high range the state will then buy your animal off of you and run a full necropsy on that animal. My state vet said she has only ever had to necropsy one deer ever and it didnt even have bovine tb. It other problems that made the deer experince the same simptom. You are correct, cwd is only tested for at the time of death. Because the only way to test is by using a piece of the brain stem.
Hope this helps out and i hope i was clear enough for you.