be the same

These two keys are the same.

この二つの鍵は同じです

These two keys are almost the same.

この二つの鍵はほとんど同じです

These two keys are almost the same as each other.

この二つの鍵は互いにほとんど同じです

These two keys look almost the same as each other.

この二つの鍵は見た目が互いにほとんど同じです

These two keys on the desk look almost the same as each other.

机の上にあるこの二つの鍵は見た目が互いにほとんど同じです