I have been prescribed Oxycodone for severe arthritic back pain for some time now. The 20 mg oval pill I have been taking, ID 93 31 was correctly noted. The pharmacy has recently changed my RX to a round pill, ID G 162. I cannot find this ID in any publication. There is a GG 162 for an entirely diferrent drug. Am I getting the same drug as in the 93 31? Thank you.