'shell script to read the line from one file and sed it in another file

I need to read the value from one file and sed that value in another file.so here is the content of the files

file1.txt

test1.example.com
test2.example.com
test3.example.com

file2.txt

### list of servers ##
[group]
server1  ansible_host=pub_ip1 ansible_user=eadmin  
server2 ansible_host=pub_ip2 ansible_user=eadmin  
server3 ansible_host=pub_ip3 ansible_user=eadmin

so the expected output should be below

file2.txt

    ### list of servers ##
    [group]
    test1.example.com  ansible_host=pub_ip1 ansible_user=eadmin  
    test2.example.com  ansible_host=pub_ip2 ansible_user=eadmin  
    test3.example.com  ansible_host=pub_ip3 ansible_user=eadmin

the first line of file1 should replace server1 in file2 and so on. I am pretty much new to bash and Linux. it would be great if someone could help me to achieve this.

Thanks in Advance

linuxsedreplace


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