Visual Difference(Element of Layout) between Different version of ArcMap

[st_123]

Hi all, 

I have noticed there is a slight difference of area of layout element (e.g. a grid / simple polygon) between version 9.x and 10.x. 

I know there is difference between ArcMap and ArcGIS Pro due to the different in Drawing Engine, I am wonder why there is also such difference between different version of ArcMap. 

layout element - ArcMap 9.2 

Layout element - 10.8.2

[DuncanHornby]

Because 9.2 is very old and ESRI stopped supporting it years ago! They obviously tweaked the UI when they moved to 10.x