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是另一回事

is another matter

→ 是
phrase Rare #23,960
is another matter Often used to contrast two things, as in “X is one thing; Y is another.”
CH: 喜欢做饭是一回事，做得好又是另一回事。
EN: Enjoying cooking is one thing; being good at it is another matter.

那是另一回事了

That's a different matter.

— 瓦塞浦黑帮(上) (2012)

他们完全是另一回事。

They’re a completely different matter.

那是另一回事。

That's a different matter.

又是另一回事了

That's another matter entirely.

— 焦土之城 (2010)