They all have the same meaning as their paired sentences.
Of the first two, The first is more natural.
Of the second three, I prefer the third. The second is close.
Student or Learner
1. ''You're using your son as an excuse for your late arrival.''
2. ''You're using your son to be an excuse for your late arrival.''
1. ''The class picked Susie class representative.''
2. ''The class picked Susie as class representative.''
3. ''The class picked Susie to be class representative.''
What is the difference?
With your second three examples, #1 would be correct if you changed "picked" to "elected".
They elected Susie class president.
"To elect" is an exception here and you don't need to follow it with anything except the noun in question. With anything else, you need "as" or "to be".
They picked her as class president.
They chose her as class president.
The picked her to be class president.
They picked her to be class president.
They elected her class president.
They elected her as class president.
They elected her to be class president.
Remember - if you don't use correct capitalisation, punctuation and spacing, anything you write will be incorrect.