JohnZ and tmodel66 are correct. As long as your brake booster precedes your build date, by a reasonable about, you probably have the correct unit. I have a "05A" or first week of May Norwood built '69Z. It still has its original "9204" stamped power brake booster date coded "108", or the 108th day of 1969 which was April 18th, which was only about two weeks before the trim tag car assembly date.
If you have the '69 Camaro Assembly Instruction Manual (AIM…a must have if you're restoring your car), page 260 covering the J52 Front Disc Brakes and Power Brake Cylinder Balance Valve & Brake Pipes show the booster and master cylinder as GM #5468165 Cylinder Asm. This assembly was built and date coded by Delco Moraine when the subassembly was built at the component plant prior shipment to the Camaro assembly plants. With a few exceptions, this was the situation on many of the subassemblies the GM component plants sent to the assembly plants. CRG has many great tech articles on the date code topic and the assembly process.
Hope this helps and good luck on your project!