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The cross sections and recoil properties of a number of target fragmentation products formed by the reactions of 4.8and 25-GeV "C and 7.6-GeV "Ne with '"Au have been measured. Comparisons between these data for relativistic heavy ions and those for relativistic protons have been used to test the hypotheses of factorization and limiting fragmentation. The cross sections for most of the nuclides measured are related for different projectiles by the ratio of the total reaction cross sections. An exception is the light nuclides {A & 30), for which enhanced yields are found for heavy-ion projectiles compared to protons. The velocities imparted to recoil fragments by the projectiles are considerably larger for the heavy ions of -0.4 A GeV than for protons, but are the same for 2.1 A GeV "C {25-GeV kinetic energy) and 28-GeV protons. Limiting fragmentation has not been reached at energies of 0.4 A GeV, as shown by the large change in recoil properties with increasing energy. The projectile kinetic energy appears to be more significant as a scaling variable than the velocity for relativistic heavy ions.NUCLEAR REACTIONS '9~Au(2C, X), (~N e, X), X= Na-9 Au, Ei& =4. 8 and 25 GeV, E20 = 7.6 GeV; measured cross sections and recoil properties; deduced mean kinetic parameters; test of factorization and limiting fragmentation.