Sorting lines in one file given the order in another file

Use awk to put the line number from file2 as an extra column in front of file1. Sort the result by that column. Then remove that prefix column

awk 'FNR == NR { lineno[$1] = NR; next}
     {print lineno[$1], $0;}' file2 file1 | sort -k 1,1n | cut -d' ' -f2-