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use warnings;
use strict;
...
  }
  
print "Done.\n";

word word word two    2 1.2 -2.3 apple   six seven eight nine
word perl word five   5 1.2 -2.3 grape   six seven eight nine
...
word word word one    1 1.2 -2.3 five    six seven eight nine
word word word six    6 1.2 -2.3 fig     six seven eight nine
word word word eight  8 1.2 -2.3 sausage six seven eight nine

oink word word one    1 2 -2.3 five    six seven eight nine
word oink word two    2 2 -2.3 apple   six seven eight nine
...
word word word six    6 2 -2.3 fig     six seven eight nine
word word word seven  7 2 -2.3 sour    six seven eight nine
word oink word eight  8 2 -2.3 lemon   six seven eight nine

Match in line 7 from data1.txt with line 6 from data2.txt:
word word word six    6 1.2 -2.3 fig     six seven eight nine
...
Note: Tailing word mismatch in previous pair.

Done.