Width of aftermarket chains?

I am trying to replace my SRAM red chain (11 sp) with an aftermarket chain and its not going well due to noise / rubbing. There seems to be a very small difference (maybe 0.5mm in width). could this be the wrong speed altogether (eg 10 vs 11) how would I tell?
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De Sisti wrote:
This is one of the silliest threads I've come across.
Recognition at last Matthew, well done!, a justified honour
tyats pretty normal tbh and nothing to worry about.
did the bag have a sticker on it?
#adhesive
De Sisti wrote:
This is one of the silliest threads I've come across.
Recognition at last Matthew, well done!, a justified honour