Algestone Acetophenide is used in combination with Estradiol Enanthate as a monthly injectable contraceptive for women in Latin America and Spain .
Algestone acetophenide is used in combination with estradiol enanthate as a once-monthly combined injectable contraceptive for women in Latin America and Spain .

Are these two sentences paraphrases of each other?
yes

The references to New Orleans were changed to Las Vegas , a reference to the negative effects of gambling in Sin City .
The references to New Orleans have been changed to Sin City , a reference to the negative effects of gambling in Las Vegas .

Are these two sentences paraphrases of each other?
no

This study also found a greater activation of the left amygdala in men and the right-wing amygdala in women .
This study also found greater activation of the left amygdala in men and the right amygdala in women .

Are these two sentences paraphrases of each other?
yes

He participated at the 2008 Summer Olympics in Beijing , where the Danish team came seventh , and the 2012 Summer Olympics in London where the team placed 6th .
He participated in the 2008 Summer Olympics in Beijing , where the Danish team became seventh , and at the 2012 Summer Olympics in London , where the team was 6th .

Are these two sentences paraphrases of each other?
yes