Lightmaps Problem when switch unity android to unity IOS

Hello Everyone, I am working in an android project in which i baked directional lightmaps in my scene. They are pretty well. I used 2048 atlas size for baking and then compress them in max size 1024. Now when i change that project targeted platform android to ios,size of lightmaps in lightmapping window is very high. Same project when target platform is Android,it have 8 dual lightmaps of 1024x1024 with size of 10MB for a particular scene. Now same scene in when target platform is IOS, shows 8 dual lightmaps of 1024x1024 with size of 92MB. I re-baked that scene in IOS build with same lightmap settings but it didn't help. Why Size of lightmaps is very high as compare to android. Please help me and sorry for my English.