YOU SAID:

Fish in bread is the same thing as bread in fish

INTO JAPANESE

パンに魚を入れるのは魚にパンを入れるのと同じことだ

BACK INTO ENGLISH

Putting fish in bread is like putting bread in fish.

INTO JAPANESE

魚をパンに入れるのは、魚にパンを入れるようなものだ。

BACK INTO ENGLISH

Putting fish in bread is like putting bread in fish.