Pi-FAN for RPi4 with 4 (instead of 3) cables?

So I bought a case called 'Unity V2' and it's supposed to be for a RPi4.
There's assembly instructions on their site showing the fan should have
3 cables (red, black and blue), but the fan has a fourth (green) cable?

<https://s3.eu-central-1.amazonaws.com/trengo/media/hc_m_W8ndrq2X1BqWddxsYFFP9hMjDnL4cj.png>

The sticker on the fan says 'Pi-Fan model: ODS-232-3007' which should
have 3 cables.

My question: can I still use this fan for my RPi4? Cut the green wire or
simply not use it?

This is what I have:
<https://i.postimg.cc/PTBW30WC/signal-2024-12-02-213434-002.jpg>

(I contacted the shop, but they haven't replied yet. Guess they are busy
with Black Friday and all that.)

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s|b