True about isozymes is:
The multiple forms of an enzyme catalysing the same reaction are isoenzymes or isozymes. They however differ in their physical and chemical properties which include the structure, electrophoretic and immunological properties, Km & Vmax values, pH optimum, relative susceptibility to inhibitors and degree of denaturation.
Reference-Haper 30th edition pg -66 & satyanarayana pg 105
They catalyse the same reaction
Same quaternary structure
Same distribution in different organs
Same enzyme classification with same number and name