yes, they are the same.
i have a "winter" brentwood, but it's exactly the same as the "summer" it just came with a liner. I can swap out the liner for the normal pads or whatever to wear a beanie/goggles (which i prefer), or i can use the padding only for biking/skating. You hypothetically could buy a "summer" one and to make it a "winter" one, you could just get the liner which you expressed you don't need anyway
ramble ramble ramble, that probably was a bad way to put it, but essentially, they are all the same, so go ahead with it