Yep pretty sure they are the same, I paid roughly the same amount for them
They differ from the official DJI ones, but then again the official DJI ones are like £10 for the pack.
I bought a new pack of spare ones as I had a slight mishap and had a motor cutout mid flight, it dropped, cracked one of the legs, and one of the hex screw threads on one of my white arms become questionable
So new official replacement white arm = £3
set of 4 legs ~ £3.50
and I bought the black landing skids as an upgrade
That was quite a hard landing though, and was a vital thing which I didnt think would happen, even with intelligent motor settings set in Naza, it still does the motor cut out if you do the left stick bottom right, right stick bottom left position (same position to start the motors)