That's super unlucky DaevM!
I will check if I've still got the packaging when I'm next home, but mine are definitely yellow/amber as tested on the car, and as you say, it's clearly labelled that way on the website. I remember the LEDs looking yellow getting them out of the packet too.
In the mean time I did a quick search on Amazon and I couldn't find any red LED 7440 by Maimiao, so it could be a mislabelled packet and someone marked red instead if yellow.
This
item (ASIN: B09CTNPLT5) is not compatible but is from the same brand, and that
is available in red. Looking at the images of it, the LEDs on that actually look red, so that could be another way of checking what you actually have in the packet if you are happy to open it.
I hope that helps, and I'll let you know if I find the packaging.