Open Question: Do I lose the ability to separate certain loan dispersements to pay them off separately if my loans are sold?

I took out several commercial student loans from one company. The first few disbursements had the same interest rate, then the next four disbursements had a higher rate. I intended to separate out the higher interest ones and pay those first, when I had the money. But my loans were "sold" to another loan company awhile back. Do I still retain all the rights I had with my first loan company now that they've been transferred? Specifically, do I still have the right to separate out those higher-interest-rate dispersements for pay-off... or can this company say to me, "Sorry, you're playing by our rules now."? Thanks!