Divides batches

If a have a commercial batch, but this is divided en three parts: one for our brand, other for other brand of other company, and the last for medical samples? it is correct to take as validation batch.

or the three validation batches should the same process until the distribution to the costumer?

could me if is possible justify the divided batches as validation batches? Which is the regulatory document to show me about the basic requeriments about validation batches?

thanks for your help