Ulrich, if the butted links are temporary, I wouldn't worry about them matching the links currently in your hauberk- if anything, it'll give it a 'used' look which actually looks better, if you get my meaning.
Also, I wouldn't move forward until you have the gambeson you want to wear underneath it- that way it'll be sized correctly. Again, I have a big bag of rings, you're welcome to what's left of it once I'm done with my project.