I want to merge two different tables in R but it doesn’t work with merge, it exceeds 10GB, what can I do about it

The names of the tables and the information in them are different

Table 1 shows humans and their proteins
Table 2 shows chimpanzees and their proteins

I want to combine these 2 tables and get a table with a total of 4 columns

the codes I tried:

a <- table 1 
b <- table 2 ## human and chimpanzee information in table 2  
c <- table 3 
d <- merge(a,b , by.x = 13 , by.y = 1)
x <- d %>%
  select(c(1,15))

h <- merge(c,b , by.x = 9 , by.y = 2)
z <- h %>%
  select(c(1,11))

z1 <- unique(z)
x1 <- unique(x)
p <- merge(x1,z1)

x1

z1

I tried merging and I tried cbind cods
merge
cbind