most of the time, yes, it makes no difference if you're online or not. results are pretty much determined before the game starts. but sometimes it makes a big difference if you enter halftime and make a change and start scoring goals, or enter the match while leading, making a change and lose... it's not a rule, sometimes it's better not to enter, sometimes if you don't enter you lose. i had matches with -50% teams when i entered half-time and since then i didn't had 1 chance to score... how the server decides this kind of things beats me, i have no idea...
another good idea is to watch your match from another account...many times worked really well for me