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Omit the explicit \" quotes. I think you had the quotes on the command line, to prevent the shell from word-splitting (each word becomes an argument).
And, since you are going to use a while loop,...

For a simple concatenation of the lines, consider paste
paste file1 file2More flexible is the shell
while read L1 <&3 && read L2 <&4
do
echo "$L1 #### $L2"
done 3< file1 4< file2