If 35 a & 35b are taken by the same camera one after another ,they will have the same colour rendition, yet 35a is typically with the red tone of C. cormasa but 35b is ochreous brown as in C. bromus.
Further more C. cormasa typically have one lower cellspot (thus Fullstop Swift.)The upper cellspot is absent or very tiny.
35b show both the cellspots as in typical C. bromus.