Chapter 15 of Sacred Stones (Scorched Sand) can be seen as a sort of proto-Fates, in that the map is the exact same in terms of house and village locations but the actual layout for your troops and, to an extent, your goal, are fairly different. In Eirika's, the best strategy tends to be to turtle up, to defend yourself until Ephraim arrives whereas Ephraim's path puts you on the offensive given the lack of troops near Eirika and the constant influx of Pegasus Knights that threaten her, even with the defensive bonus of the burnt palace. Of course, both still require to get rid of all the enemies, but the strategy needed to fulfill that goal is different for the two of them due to where your units are deployed and when reinforcements arrive...as well as waiting for Colm/Rennac to get the hidden treasures but that's just standard desert level fare for Fire Emblem. Frankly, I wish more maps in Sacred Stones had that sort of difference for the maps the twins share like Fates did since the ones after only differ by changing up a few enemies like Druid-Sage, Hero-Warrior, etc. since Sacred Stones isn't the most challenging of the GBA entries.