Women don't always earn the same as their male peers for the same job
Not all women receive the same salary for the same type of work in the same company as men なら大丈夫だと思いますが、確かに少し長いです。
Women don't always earn the same as their male peers for (doing) the same job や Women don't always receive the same pay as their male peers はいかがでしょうか。Women don't always earn the same amount as their male peersも大丈夫です。
earn - 収入を得る
male - 男性
peer(s) - 同等の地位の人。つまり、「同僚」です。
同等の地位の人ですから、同じ会社、業務の内容やランクも同じだと推測することができるので for the same jobは要らないと思います。
Not all women are paid the same as men for the same work.
Not all women receive the same salary as men for the same job.
「同じ仕事でも男性と同じ給料をもらっているとは限らない」は英語で「Not all women are paid the same as men for the same work.」と言います。kazukoさんがおっしゃった「Not all of the women receive the same salary for the same type of work in the same company as men.」は文法的には問題ないですが、自然な文章と感じていません。jobとworkはどちらでも使えます。
同じ仕事でも男性と同じ給料をもらっているとは限らない。
Not all women receive the same salary as men for the same job.