John Deere mower decks are generally designed to be interchangeable between different models of tractors, however, the ability to interchange will depend on the specific mower deck and tractor model. Some mower decks are only compatible with certain tractor models, while others can be used with a wide range of tractors. John Deere mower decks are often divided into a series, such as the 100 series, X300 series, and the Ztrak series, each series is designed to be used with a specific range of tractor models, so it's important to check the compatibility before purchasing a mower deck. When it comes to the attachment of the mower deck, it's important to note that each deck has a specific mounting system and the mounting systems are different from one series to another. So, it's important to check the specific mower deck compatibility with the tractor model before purchasing. It's also recommended to check the operator's manual for the specific tractor and mower deck to ensure compatibility and for instructions on how to properly attach and use the mower deck. John Deere dealers can also provide information and assistance on mower deck compatibility and installation.