The only reason something is impossible; is because someone hasn't done it yet. For this particular question; the only reason it's impossible for casualties to be different is because someone hasn't proven otherwise (yet). During the September attack on NYC in 2001, casualties were (by Televison/radio) initially reported to be as high as 50,000 people. For the student historian: statistics will almost always be different. They will almost always NEVER be accurate. If TWO men are on the same battleground, on the same time and day, during the same event...you will get TWO views of the battle; TWO different reports (after action reports). One or both of those reports will go into the history books.
See: Attack on Pearl Harbor
About more than 2,000 people
Yes 2,402 were lost during the attack and 1,282 were wounded.
7 civilian casualties
2,403 deaths occurred due to the attack at Pearl Harbor - 68 were civilians so 2,335 were military.
Mostly the United States, but Japan suffered casualties as well.
The trops involved in Pearl Harbor are for me unknown, but the casualties are the following. 2,400 servicemen killed 36 civilians killed 180 Wounded
The US was NOT at war.
There were approximately 5,000 US casualties, of which approximately 2,300 were fatalities.
America suffered very heavy casualties from the surprise Japanese attack on Pearl Harbor on December 7, 1941. Truman decalred war the next day on Japan.