I find that I actually think differently and my body language changes depending on the language I'm thinking it. For example, when I think in French, I use my hands a lot more. When I think in Japanese, hierarchy becomes a lot more important in how I think.
I don't know if I can confidently say that I have a similar experience, but this is cool! I can only speak for English and Greek, because speaking French is still a little unnerving. I guess I use more facial expressions when talking in English? Not a very drastic difference though