The neutron time-of-flight spectrometer TOFOR and the low- and high-energy Neutral Particle Analyzers (NPA) KR2 and KF1 are instruments capable of indirectly diagnosing fast deuterium ions at JET. The diagnostics rely on different physical processes: neutron emission from fusion reactions and neutrals emission by charge exchange. Modeling has been developed to derive the Energy Distribution Functions (EDFs) of fast deuterons based on the measured data. This work presents the first cross-validation of EDFs obtained independently from TOFOR and KF1 (with overlapping energy ranges). The validation of TOFOR and NPA measurements is important to form a solid basis for the fast ion diagnostic techniques to provide reliable information in the ITER relevant energy region Ed<1 MeV.