I could be wrong, but I thought that DEPOT was just for Reserves coming in directly as a Petty Officer, and everyone for the active side went through the regular 8 weeks, no matter what.
Also, they may ask who was prior service when asking for certain jobs like squad leader. The CC's may know if they look at your record, but I imagine it will be irreverent, unless something thing administrative like your pay isn't what it is supposed to be, or you need a service stripe for your Bravos. I know someone who went through about 6 years ago, who was in the Marines prior to the Coast Guard. He did the full 8 weeks, and I think the CC's asked his company as well. I think the only thing it may really effect, is that you know what you will experience, and how you react to the stress that Boot Camp is designed to create. Hope that helps.