If you just move the object files from your 1.4 into 2.3 files... then it will work. I assume it works backwards also... depends if 1.4 supports objects 10+
Next issue.. you cant just edit your object.wils , as maps wont work. The object on the map, is linked to that object cell.. not the object in the cell.
For example if you took object 00001.. and swaped it with 00002, the map wouldnt know this.. so it would still show the object from the cell 00001, which would be the object from 00002.
Last issue.. the reason for most maps from 1.4 not working on 2.3, is becasue the object.wils you had then were customized with carttony maps.. whereas most 2.3 servers all work off korean files.. which dont contain these, and have been put in the slots which the cartoony maps were placed.