I assume that if it only said A1 it would mean 
there might be others that look similar to it?

If it only said A1 (and not A1 END) then, yes, 
the next cel in that sequence (A2) would look 
somewhat similar.  I believe the longer the 
sequence is the more similar the cels following 
each other are.  For example, I own an A57 shot 
of Yue in flight from the 2nd CCS movie and I've 
seen the A56 cel that comes right before it and 
they look almost exactly alike.  :)

Beautiful Inu Yasha cel by the way!  XD  I 
wouldn't mind having one of those myself.

Hope I helped -
Sarah