A 147 guy getting punched by a 147 guy will get hurt just as much as a 168 guy getting punched by a 168 guy... depends on their build really but until cruiser weight the majority of boxers are the same build... just different heights. If Ricky Hatton was 3 inches taller he would probably be a light heavy.

I'd rather get punched by some one my weight at a weight I was strong at than cut down to a weight I was weak at and get hit by some one naturally strong at teh weight