Veyy˚ is a (purely phonetic) diaeretic form of vy˚, for which viy˚ & veyy˚ are used indiscriminately. There is as little difference between viy˚ & veyy˚ as between vi˚ & ve˚ in those cases where (double, as it were) abstract nouns are formed from words with ve˚ (vepullatā, vemattatā, etc.), which shows that ve˚ was simply felt as vi˚. Cp. the use of e for i (esp. before y) in cases like alabbhaneyya>˚iya; addhaneyya>˚iya; pesuṇeyya>˚iya, without any difference in meaning.