▲你的两个句子都是对的，用不用 just 都可以（但以用 just 为普通），so 引出的句子用不用倒装也都可以（但以倒装为普通）。如：

As they get smarter, so do the crooks. 他们变得更聪明了，骗子也是。（《新牛津英语双解大词典》）

Just as you hate Mr. Green, so I dislike his wife.（张道真《现代英语用法词典》）just 词条）

Just as French people enjoy their wine, so the British enjoy their beer. （张道真《现代英语用法词典》）so 词条）

▲顺便说一句，《柯林斯高级英语词典》在 so 词条对该句式作了说明：You use the structures as...so and just as...so when you want to indicate that two events or situations are similar in some way.（表示两个事件或情况在某方面相似）正如……，也……。该词典对该句式共给出了三个例句，均为倒装句（有两个句子用了just，有一个没有用 just），抄录如下：

(1) Just as John has changed, so has his wife. 约翰变了，他的妻子也变了。

(2) As computer systems become even more sophisticated, so too do the methods of those who exploit the technology. 正如计算机系统变得越来越先进，开发计算机技术的人所用的方法也日益先进了。

(3) Just as the teacher plays the role of leader in the classroom, so does the headteacher play a leadership role in the school. 在课堂上老师扮演着领导者的角色，同样，在学校里校长也充当着领导者的角色。