Compar two arrays in a grid ?

i have a use case, where i need to display two arrays - a before and after if you will.

local!array1:{"Dog","Cat","Mouse"},
local!array1:{"Dog","Cat","Mouse","Elk","Rat"}

ideally i'd like to display them in a grid, so that the user see's a nicely formatted list - which I can then add some functionality too. Something like :

----BEFORE---- AFTER----
-----------------------------------
----Dog     ----- Dog ---------
----Cat     ------Cat ----------

----Mouse ---- Mouse -----

----NULL ------- Elk --------
----Null ------- Rat ----------

However / whatever i do, i keep tripping over that the gird only really wants to parse one data array. if i try using the two different arrays in the row then I soon trip over having different array lengths.
Any ideas ?