Lord Kinlar
Master Knight
If you want them to look the same, then you should give them only one item of each type. The game will still pick the equipment randomly from the item pool, but as there's only one choice for each item type, there will be no variation in equipment and your troops will more or less look the same. Depending on the guaranteed items for that specific troop type, certain items may or may not be used by all and that, of course, will cause a slight variation.