The short answer is yes, a subsequent conviction on the South Carolina case could be deemed a probation violation on your Virginia probation, provided that your probation officer in Virginia is aware of it. Speak to a defense attorney, either in South Carolina or Virginia, about this issue. The attorney will be able to advise you of your options and may be able to work out an agreement among your two probation officers (presuming you're placed on a probationary sentence on both charges) to prevent a violation from issuing. The fact that the underlying conduct in the South Carolina case preceded the Virginia case in time will likely be a mitigating factor to a Virginia judge even if you are at some point violated because of it.
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