As we discussed before, your original informal probation court could find out about the new misdemeanor. Similarly, the court with your new misdemeanor can see your earlier case as an arrest or charge pending without disposition and will, likely, inquire either of you (you may not have to answer) or the DA of the status of that case. Hire counsel to defend both cases as I suggested before.
The information provided herein does not create an attorney-client relationship. The information provided is to suggerst some general principles and should not be relied upon for client decisions. Only upon the hiring of counsel can such advice be custom-tailored to the client's specific situation and needs.
Assuming this is the same person that asked the similar question earlier, I suggest reviewing the answers that your previous question. You've gotten great free advice from a number of qualified attorneys. Keep your head up, and good luck.