Eze 28 refers to the overthrow of the king of Tyre. Isa 14 (in Hebrew) talks about the Babylonian god Helel who is associated with Venus, the morning star, dawn/light. There is no connection in either of your quotes to the OT Satan, whom Judaism considers a faithful servant of God with no powers of his own.
In Greek the verse calls him fwsforoV that is phosphoros (i.e. the one who shines, light-bearer, morning star), which +Jerome translated into the Vulgate as Lucifer (from the Latin word lux for light).
It is only in the NT that the Christians are being introduced to the concept that Satan and Lucifer/devil are one and the same. This connection apparently existed in some common classes among 1st century Jews, and is mentioned in various books which are not part of the Pharisaical Hebrew OT. However, the concept does appear in OT Septuagint, which is the source used for most (over 90 percent) of OT verses quoted in the NT by the Apostles.
Because the Apostles treated Septuagint as Scripture, the Church included those books in the Christian canon. Martin Luther threw them out and accepted the Pharisaical OT of the Christ-denying rabbis of Jamnia, which the Protestants use to this day.
As the revelation of Jesus Christ, we get confirmation in the Book of Revelation and in the NT that Satan is Lucifer, Satan is the Prince of this world, Satan is that old serpent in the garden.
For you to make the assertion that the Jews had no concept of him falling from heaven is incorrect and scripture proves it.