From what I can see it appears to me that the chances of you two being the same user is higher than the reason you have stated, I believe this to be true because your sales threads have been posted from a Hosting/WebServer, no actual ISP, the posts of yours I checked are also from a UK Cloud server/Hosting, again no actual ISP. My assumption was that screw-it is your main account. I wouldn't let you run the service with a thread posted using a hosting service given that you have an IP match with another user. It is ultimately upto the higher staff.
@Flengo