The enzymes which catalyze the same reaction but have different amino acid compositions are commonly referred as:

Isoenzymes (also called isozymes) are different molecular forms of an enzyme that catalyze the same chemical reaction but differ in their amino acid sequences, kinetic properties (Km, Vmax), regulatory properties, or tissue distribution. A classic example is Lactate Dehydrogenase (LDH), which has five isoenzymes distributed across different tissues like heart, liver, and muscle. Isotopes are atoms of the same element with different mass numbers. Isomers are molecules with the same molecular formula but different structural arrangements. Coenzymes are non-protein organic molecules that assist enzymes in catalysis (e.g., NAD+, FAD, Coenzyme A).