When using NukeX, you have all the features of Nuke in use, plus the following:
• CameraTracker
• DepthGenerator
• Denoise
• FurnaceCore
• Kronos
• LensDistortion
• MotionBlur
• ModelBuilder
• Particles
• PlanarTracker
• PointCloudGenerator
• PoissonMesh
• PrmanRender
• ProjectionSolver
• VectorGenerator
Nuke and NukeX are fully compatible, with Nuke capable of viewing and rendering - but not editing - NukeX features.