Yes, you want to use the same size needles as you used for the front and back.
Sometimes patterns call for two sizes of needle, one for the bottom edge, cuffs and collar and one for the body of the sweater. Since you may not be using the recommended size, the instructions sometimes say "Use the larger needle..." meaning the one used on the body of the sweater.
Thanks for the pattern link. It's a very nice looking, comfy sweater.