no, at this point , there is no proof that there is a system of converting the cyrillic letters to numbers.
i researched into the conversion of cyrillic letters to cyrillic numbers to see it if they mean something, like a month or a year but came up empty.
i have two russian SKS with SN 400 apart but they were produced a few years apart.
the problem is the old russian recycle the SN every year so every year there will be a duplicate of SN. unfortunately it gets worst bcos they use cyrillic letters and some cyrillic letters are not recognize by CFC so dropping them will results in dozens of matching SN.
leverarms having more problems now bcos they are a late comer , IZH and Bell already taken the SN but the next IZH shipment may face the same problem unless they stamp an extra letter(s) like on some Bell which i do not like.
the US solved most of the problem by translating the cyrillic letters to english letters and then stamping a new set of english letters on the receiver.