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You are amazing!
Appreciate your help, I was fighting with that about 2 hours.

Output should look that:12345678
12345678
12345678
x & x & x = z & z
x & x & x = z & z
x & x & x = z & z
12345678
12345678
12345678




This function is very close, although dont replace...

Here is my simple script:

awk.sh:awk ' BEGIN { RS="" }
FILENAME==ARGV[1] { s=$0 }
FILENAME==ARGV[2] { r=$0 }
FILENAME==ARGV[3] { sub(s,r) ; print }
' 2 3 1 > out

...