Is it common practice to reuse the same implant for a 2nd capsulectomy?

It is an absolute containdication to use the same implant due to the fact that there may be a biofilm on the implant that is leading to the capsular contracture.  Perhaps the reason you have a recurrence is the fact that the wrong operation is being done to correct the contracture.  I highly recommend that you see a surgeon that performs this type of surgery regularly and is board certified. 

Dear Flies home
In general, it is not customary to reuse same implant, however, it will depend on you and your surgeon and the reason for the surgery. In the context of capsular contracture, I would not reuse the same implant. The risk of recurrence of contracture might be higher.