library(gtools)

df1 <- data.frame(a = 1, b = 2, d = TRUE)
df2 <- data.frame(b = 7, c = "YES", d = FALSE)
df3 <- data.frame(b = 7, c = "YES")

smartbind(df1, df2, df3)
smartbind(df1 = df1, df2, df3 = df3)