It depends ... Has your less active cat LOST wt on a indoor/ light diet ?? If yes then youll likely need to feed them in separate rooms one getting ADULTor Kitten( I have a 3.5 yr old on kitten doing GREAT and she isnt a large cat)... and a lite or indoor formula for the other... IF the kitty has NOT lost wt then try kitten it is HIGHER in FAT and PROTEIN thus lower in CARBS,,, MOST CATS do NOT need carbs
past 10 % total diet, most kitten foods are 20-30% carbs, Adult 25-40% carbs , lights / indoor 30-60% carbs....
look at these brands
Senisible choice ( this is a good mid calorie option)
Castor and polluck
all are BY product of animal free , artificial color and flavor free , all but Royal canin are GROUND corn free ( most not even having corn gluten), chemical preservative free