I think Pierre prefers (and most cutomers, too) to make strings to an exact measured length, i.e. take it off and measure it. This is important in maximizing string performance, especially with skinnies. I have owned two different model 60" recurves by the same manufacturer that were approx. 3/4" different in string length at the same brace. (Too much to interchange by twist). I doubt if your bows take the exact same string length. I'd give Pierre a call and discuss shooting big recurve loops on a long bow, even if they were close enough. Your nock point could have to be moved on the interchange even if you got by all those hurdles.