如果说在什么方面相似怎么表达，similar on ? or sth else

similar in + n. e.g.: similar in efficiency/shape 性能/形状方面相似
similar + adv. e.g.: similar mechanically 结构上相似
similar in that + 从句 e.g.: The two writers are similar in that they like using difficult words. 这两位作家的相似之处在于他们都喜欢用难懂的词。
similar in the way(s) (that) + 从句 e.g.: The two products are similar in the way they are processed.
这两种产品在加工方法上相似。

have similar + n. + in...
be similiar in ...

similar on

with
to

similar with sth