Andersen Balancer / window sash

Hi, I have Anderson double hung windows where the upper is 24" tall and the lower 36" tall. I sent a question earlier bust since then I removed the other balance and thing that there may be a right and left unit as the weight of the upper and lower windows vary. The left side balance has the numbers 11600-17 and 11600A-s stamped on the unit. However, where the the screw or staple attaches the unit it the Frame it has the numbers R13/927 then on the other side of the screw hole is BP8 1296. The Right side balance has the same numbers stamped on the case 11600-17 and 11600A-3 but the numbers stamped on the mounting flange are slightly different, they are: L9/1327 and on the other side of the screw hole is R12 1296. Unfortunately, both the cables on the larger window broke so there is no way for me to tell if one cable has more tension than the other. Both cables appear to be the same diameter.

Thank you for your help......just what you need to see on a Monday morning!

Regards, Todd