Well, maybe the solution is a bit simpler:

open all files
grab all lines from file 2 - split each line into 2 strings( $number, 
+$year)
concatenate $number.$year into one $searchvalue
make hash with keys of $searchvalue and values=1
for each line in file1:
   split each line into 3 strings( $number2,$year2,$string2 )
   concatenate $number2.$year2 into one $searchvalue2
   look for that key in the hash
   if it is there, spit the line
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Hope this helps