Awning annexe compatibility between brands

Hi everyone,

I just got a Royal Armscote Air 260 awning, it was a good price obviously cos it's 'Old Stock' and isn't a current model of Royal.

I've been looking for an Annexe for it, (Royal Paxford Annexe), and as I'm finding out, these are out of stock due to not being a current model as well,

Looking around some of the Vango annexes look virtually identical, has anyone used different brands on the annexes successfully ??

It's not the end of the world, we only really use the awning for wet clothes, towels and muddy boots etc, but now that I can't find an annexe anywhere, it's really bugging me :) and becoming a bit of an obsession to find one...... (yes, my life is that dull)  lol,

thanks for any pointers in advance