Vintage Rose Coasters & Ladybird Books

When I was little my Gran had a set of coasters with photographs of roses on them, they had pale blue backgrounds and looked exactly like the roses my Gramp grew in the garden, I absolutely loved playing with them.

Recently I found a set of Worcesterware rose coasters, and I can't decide if these are also photos or if they are illustrations. After watching the recent BBC Timeshift programme on Ladybird books, I realised the coasters were just like some of the illustrations in their books of the 1960s. I wonder if the same artist created both the book illustrations and the coasters? Anyone know?