I got slammed by a nasty flu bug earlier in the week ... otherwise I would have nurtured this topic along a bit better, sorry.
These #13 holes are from Harborne and Broadstone, respectively -- both Colt redesigns.
My thinking went something like this: same shaping ... missing bunkers at Harborne?... how did Colt see better vs. novice player playing second shot in 1924 vs. 1914? ... and different land/totally different locations - Dorset and Birmingham ... routing sequences differ ... green template fit into one or other or both routings? Etc.
(Ed. Plus one more that I forgot to include in the above impression of cognitive loosening: would Colt need those greenside bunkers today?)
Colt redesigned Broadstone in 1914, during an extremely busy period just before he entered the war -- on the Colt timeline, following completion of the Eden Course, work at Royal Montreal, visits to Pine Valley, and designing Hamilton and Detroit CC, in addition to work on over a dozen other courses -- and Harborne in 1923/24, around the same time as Sunningdale New and Tandridge, for instance. I wondered if he for whatever reason used the same plan from Broadstone #13 at Harborne? From all I've read thusfar, I get the sense that his approach to certain design problems was undergoing a significant change just before WWI. Another detail in the two pictures, as Paul notes, one green is Redan-like, the other is not. Was Harborne's more steeply sloped at one time? Or was this a variable built in so as NOT to repeat? More extensive green one time at Harborne (as Phil notes)? How often did Colt & Alison re-employ certain macro design features, beyond the more subtle tell-tale signatures that make up a style?