Yes the other court will find out - the DA regularly runs raps, especially since he/she just filed on you - they will know about the other county. Now, whether the other county does anything about it is anyone's guess - DA's don't have the power to request probation revocations in counties not they're own. But it's a safe bet they know about the other conviction. Get an attorney to assist you.
Mr. Feasel is a former Deputy DA in the SF Bay Area with over 10 years of criminal law experience. Nothing stated on this site shall in anyway be construed as legal advice, or as creating any attorney/client relationship. If you would like to hire Mr. Feasel to further investigate your situation, feel free to contact him thru this site.
It doesn't sound like you have a probation of violation. However on the other case you are going to court for you should have an attorney represent you - either paid or the public defender. You might have a speedy trial issue to raise.
The above information does not establish an attorney client relationship nor is it meant to provide legal advice.
If your arrests were two weeks apart, there is no probation violation if you weren't on probation yet at the time of the second arrest. The fact that you were charged with the second violation while on probation for the first is irrelevant. The two courts will find out about the other. You should have an attorney to argue for a probationary sentence on the second case as well.