things that look similar but are completely different
Idiomatic expression comparing two unrelated items that happen to share a superficial resemblance. Often used to point out a flawed comparison.
His explanation is like comparing geta and grilled miso—completely unconvincing.
The expression literally means 'geta (wooden clogs) and grilled miso,' two items that are both brown and rectangular but otherwise unrelated. The exact origin is uncertain, but it is a traditional Japanese idiom.