Homalopoma subobsoletum is a species of small sea snail with calcareous opercula , a marine gastropod mollusk in the family Colloniidae .
Homalopoma subobsoletum is a kind of calcareous sea snail with small opercula , a marine gastropod mollusk in the Colloniidae family .

Are these two sentences paraphrases of each other?
no

It begins near the western extremities of the Central Oregon Coast Range and generally flows to the west south of Depot Bay and north of Otter Rock .
It begins near the western extremities of the Central Oregon Coast Range and flows south to the ocean in general to the west of Depot Bay and north of Otter Rock .

Are these two sentences paraphrases of each other?
no

Known brands are Alka-Seltzer in the United Kingdom and Eno in the United States .
Well known brands are Alka-Seltzer in the United Kingdom , and Eno in the United States .

Are these two sentences paraphrases of each other?
yes

The Panthera tigris sudanensis is a claimed subspecies of tiger , not scientifically recognised , allegedly living in Africa .
The Panthera tigris sudanensis is a supposed subspecies of the tiger , not scientifically recognised , allegedly living in Africa .

Are these two sentences paraphrases of each other?
yes