By contrast , the lemmings are strikingly colored and behave aggressively towards predators and even human observers .
Lemmings , by contrast , are aggressively colored and behave conspicuously towards predators and even human observers .

Are these two sentences paraphrases of each other?
no

It also uses 4 symbols for labialized Velar consonants , which are variants of non-labialized velar consonants :
It also uses 4 symbols for labialized velar consonants , which are variants of the non-labialized velar consonants :

Are these two sentences paraphrases of each other?
yes

The Greeks and Romans identified the region in the 3rd century BC as Gangaridai , a mighty kingdom of the historical subcontinent .
The Greeks and Romans identified the region as Gangaridai , a historical kingdom of the powerful subcontinent , in the 3rd century BCE .

Are these two sentences paraphrases of each other?
no

Chelsey Tregear ( also known as Chelsey Nash ) is an Australian netball player who plays for the Melbourne Vixens in the ANZ Championship .
Chelsey Nash ( also known as Chelsey Tregear ) is an Australian netball player in the ANZ Championship , playing for the Melbourne Vixens .

Are these two sentences paraphrases of each other?
yes