i am playing a 451v and having problem playing against 442 for the past 2 season.
if you have a good dl/dr 442 can beat 451v as the formation depend mostly on aml/amr.
you have the advantage on your 4 line midfield plus 2 striker, play mixed attack. i myself play a 442 classic against 451v with success. it all depends on your player and know how to use them.