did you buy your E used? it might already have key less and all you would need is a fob, good way to check is follow the handa install manual and see if the box is snugged under the dash, if it is get the codes off of it and order a key fob on eBay that matches the code, follow handa install again to set the key to the car.
IF it doesn't have the key less box and everything already it should indeed work since it works for a lx 06 and the ex is simply the upgrade.
my 2004 LX came with key less and i think after 04 they came factory no matter what but i could be wrong
hope this helps and wasn't a terrible ramble
EF