This shows us that both Ezekiel and John saw similar visions. The Old Testament bears out the New Testament. That is why it is important to study both.
Both were priests or linked to the priesthood Ezekiel 1:3 History
Both were held captive against their will Ezekiel 1:1 Rev. 1:9
Both were near water when their visions occurred Ez. 1:1 Aegean Sea
Both saw heaven open and saw visions of God Ez. 1:26 Rev. 4:2
Both saw the four-faced living creatures Ez. 1:10 Rev. 4:7
Both saw the throne of God and the God of the throne Ez. 1:26 Rev. 4:3
Both saw a rainbow around the throne Ez. 1:28 Rev. 4:3
Both saw a scroll filled with woes and troubles Ez. 2:10 Rev. 6
Both were told to eat a scroll and prophesy Ez. 3:1 Rev. 10:9
Both saw angels mark the heads of the righteous Ez. 9:4 Rev. 7:1-3
Both saw the judgments strike Israel and Jerusalem Ez. 14 Rev. 11:13
Both saw a Jewish remnant Ez. 12:16 Rev. 12:17
This shows us that the word of God is in correlation throughout the Bible.