Anderson sash balances

A handy person from Pittsford,NY says:
The sash cords on two of my Anderson double hung windows have broken.
Assuming there is no way to replace just the cord, I need 4 new balances for two windows.
Are there a left/right pair for each window or can the same part be used for each side?
The left and right have different numbers along one side as shown by the attached photos of the balances in place in the head rail of one window. Each has another number that may be the same but is only legible on one of the balances.
As looking from the inside out:
Left balance P90 R13/927 2-88 & 11600-17
Right balance L9/1327 2-88 & maybe 11600-17

Which number do I use for ordering replacements?

User submitted photos of a window balance.
Profile picture of Paul
Paul from SWISCO responded:
Looks like you have cottage windows where the top sash is shorter than the bottom sash. Therefore you will have a left and right top balance to compensate for that. Based on your stamps, I recommend our 24-L9-1327 (left) and 24-R13-927 (right) for both windows.
A quick learner from Pittsford,NY says:
Thanks for your confirmation. You are correct. The top sash is shorter than the bottom. I have ordered two each of the above parts. One of them is on back order.
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