Unofficial LEGO Sets/Parts Collectors Guide - It is always interesting when 2 major versions of the same LEGO sets are introduced. For example, the 6523 Red Cross Set introduced in 1987 comes
LEGO MOC 6523 X-ray device by se1977 | Rebrickable - Build with LEGO
BrickLink - Original Box 6523-1 : LEGO Red Cross [Town:Classic Town:Hospital] - BrickLink Reference Catalog
6523-1: Red Cross | Sets | Clabrisic
BrickLink - Set 6523-2 : LEGO Red Cross - Dansk Røde Kors Edition [Town:Classic Town:Hospital] - BrickLink Reference Catalog