Hello Everyone. Newbie here. I'm from Sri Lanka. I have been using linux almost for 2 years now. Most of the time copying & pasting. Now I thought give it a go with learning linux instead of copying. So I started going through LFS book. Currently I'm on Xubuntu 20.04.5 on AMD 64 laptop. My question is Xubuntu uses some of the listed software on the LFS book newer ones and some are not installed at all.
Now LFS suggests using exact same software versions that are used making the book. How can I do it?? Is it ok to download 2 versions of the same software? If installed, What is the version be used when building software?

Here I included the results from version-check.sh script.

bash, version 5.0.17(1)-release
/bin/sh -> /usr/bin/dash
ERROR: /bin/sh does not point to bash
Binutils: (GNU Binutils for Ubuntu) 2.34
version-check.sh: line 12: bison: command not found
yacc not found
Coreutils: 8.30
diff (GNU diffutils) 3.7
find (GNU findutils) 4.7.0
version-check.sh: line 25: gawk: command not found
/usr/bin/awk -> /usr/bin/mawk
gcc (Ubuntu 9.4.0-1ubuntu1~20.04.1) 9.4.0
g++ (Ubuntu 9.4.0-1ubuntu1~20.04.1) 9.4.0
grep (GNU grep) 3.4
gzip 1.10
Linux version 5.15.0-53-generic (buildd@lcy02-amd64-091) (gcc (Ubuntu 9.4.0-1ubuntu1~20.04.1) 9.4.0, GNU ld (GNU Binutils for Ubuntu) 2.34) #59~20.04.1-Ubuntu SMP Thu Oct 20 15:10:22 UTC 2022
version-check.sh: line 40: m4: command not found
GNU Make 4.2.1
GNU patch 2.7.6
Perl version='5.30.0';
Python 3.9.13
sed (GNU sed) 4.7
tar (GNU tar) 1.30
version-check.sh: line 47: makeinfo: command not found
xz (XZ Utils) 5.2.6
g++ compilation OK:

Bear with me as I'm a non native. Thank you in advance.