Isobars of elements have same:

Isobars are atoms of different elements that have the same mass number (A) but different atomic numbers (Z). For example, Argon-40 (Z=18) and Calcium-40 (Z=20) are isobars because both have mass number 40 but different numbers of protons. Atoms with the same atomic number and number of electrons but different mass numbers are called isotopes. Atoms with the same number of neutrons but different atomic numbers are called isotones. Since isobars are different elements, they have different numbers of protons and electrons but the total nucleons (protons + neutrons) are equal.