Lindsey, not an expert here, but I am not sure I understand the question? You are comparing Blc Rustic Spots and Blc Emily Simmons and you are asking why those two look so different?
Surely you have already looked up their immediate parentage at the RHS website ( see below) and noticed different parents?
Rustic Spots
http://apps.rhs.org.uk/horticu...
Emily Simmons
http://apps.rhs.org.uk/horticu...
and here is Emily Simmons at "room genealogy" where you can see the whole parentage down to the primary cross. Please take a look!
http://www.orchid.or.jp/orchid...
and Rustic Spots
http://www.orchid.or.jp/orchid...
The parentage is totally different. If this was not your question, I certainly do apologize!