Yard Mastery Flagship 24-0-6 is an alternative, though not exact. The NPK analysis on Carbon X is 24-0-4 and the Flagship is 24-0-6. Carbon X has 2% Iron and Flagship has 3%. The major differences would be in the missing Sulfur (14%), Carbon (7%) in Carbon X and its Carbon Release Root Promoting (CRRP) Technology (biochar). But Yard Mastery does include Bio-Nite, which is a South Florida-based biosolid (similar to Milorganite). Carbon Phix from Kelp4Less has much more similar percentages to Carbon X (CX DIY).