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は別物だ

is a different thing

→ は
phrase Rare #43,476
is a different thing Used to emphasize that two things are distinct and should not be treated as the same.
JA: 経験と知識は別物だ。
EN: Experience and knowledge are two different things.

知っていることと、実行は別物だ。

Knowing something and actually doing it are two different things.

学識と常識は別物だ。

Academic knowledge and common sense are two different things.

話すことと書くことは別物だ。

Speaking and writing are two different things.