The BIG problem with replacement keys is the one I have! That is, I only got one key with my car, BUT, Landrover in their wisdom, stuck a silly sticker on the fob, which by the time I had it, had long-gone!!
So what key do I have?? I don't know, so what key do I order?? I don't know that either, nor do landrover!!!
I read somewhere that keys 1, 2 & 3 are slightly different colours, but since I have only one, again, what to order!!
What I DO know is that if the WRONG key is ordered, i.e. the same as you already have, it won't work either!!
My personal ONLY answer is to find some kind RR owner with all 3 keys is to compare mine with his, any takers??
NO key bought second-hand will EVER work or be re-programmed to suit any other RR
Even giving Landrover my key will not enable them to supply the replacement, I/you HAVE to know the existing key number, what a bummer:-(