At least the magazine box is different. The follower and spring may be depending on the model. I'd suggest you go to Remington Parts Information and look at the part numbers for your ADL rilfe and what you're changing too.
You can buy most parts direct from Remington. Also Brownells and Midway USA.
I have done this twice recently. I bought from a gunsmith all the parts needed inlcuding the stock for $85. the stock was $20 and the bottom metal including spring and follower $65. when they do builds generally the stock is not used and if a guy is building a gun with a detach mag, he isnt using the bottom metal. not sure if the spring and follewer are different, but for cheaper than new you could get both anyway. good luck