My sense of it is that John of Patmos was familiar with the Book of Zechariah. The degree to which the older prophecy influenced John's revelation is hard to determine. But I would say that while the lampstands are not exactly the same, they are connected.

Both visions involve two godly leaders represented by two olive trees. But in John's vision there are two lampstands while in Zechariah there is only one. What is the same is not the lampstands but the oil that fuels them, which is both the oil of illumination and the oil of anointing. But the circumstances are different. In Zechariah's vision, the olive trees are Zerubbabel (the governor, who was last descendant of David mentioned in the OT) and Joshua (the high priest). In John's vision, the two witnesses are not identified.

Conclusion: there is certainly a connection here, and it is a very intriguing one. The lampstands cannot be identical, but their function may be the same. Just as the interpretation of Zechariah led some Jews at the time of Jesus to expect a priestly messiah as well as a royal one, so the interpretation of John's lampstand and his two olive trees has led to many various interpretations over the centuries.

My sense of it is that John of Patmos was familiar with the Book of Zechariah. The degree to which the older prophecy influenced John's revelation is hard to determine. But I would say that while the lampstands are not exactly the same, they are connected.

Writing in Patheos.com, Philip Jenkins presents a similar view:

Revelation’s description of the Two Witnesses as two olive trees or lampstands/candlesticks is a direct recollection of an exceedingly influential passage in Zech 4. By the second century BC, that same passage was being read in messianic ways, and helped shape the idea of dual messiahs (kingly and priestly) that was held at Qumran.

Both visions involve two godly leaders represented by two olive trees. But in John's vision there are two lampstands while in Zechariah there is only one. What is the same is not the lampstands but the oil that fuels them, which is both the oil of illumination and the oil of anointing. But the epoch and characters are different. In Zechariah's vision, the time is just after the return from the Exile. The olive trees are Zerubbabel (the governor, who was last descendant of David mentioned in the OT) and Joshua (the high priest). In John's vision, the two witnesses are not identified, but the time is now that of the Second Coming.

Conclusion: there is certainly a connection here, and it is a very intriguing one. Just as the interpretation of Zechariah led some Jews at the time of Jesus to expect a priestly messiah as well as a royal one, so the interpretation of John's lampstand and his two olive trees has led to many various interpretations over the centuries. In short, the lampstands cannot be identical, but their function may be the same.