Hello! I currently own a Merkur 38c and was looking into getting a slant 37c/39c. I was wondering if I purchased the 37c will the heads be interchangeable so I can have both the heavier longer handle and the shorter handle if I decided to use that for clean up reasons? Any help would be great. I would like to be able to use my closed comb on both as well as my slant on both if possible...Thanks B&B!