No, Han unification is a completely different thing. Unicode Han unification represents distinct glyphs as the same code point - the intent is that you choose the glyph you want by setting a font (!). This has been acknowledged as a mistake.
Having distinct code points for Latin capital letter A, Greek capital letter A, and Cyrillic capital letter A is the reverse, separate code points for glyphs that are identical by definition. That's also a mistake.
(Although it might be required by Unicode's other principle of being fully compatible with a wide variety of older encodings. There are many characters, like 囍, that don't qualify to have a code point, but that have one anyway because they're present in an encoding that Unicode commits to represent.)
Having distinct code points for Latin capital letter A, Greek capital letter A, and Cyrillic capital letter A is the reverse, separate code points for glyphs that are identical by definition. That's also a mistake.
(Although it might be required by Unicode's other principle of being fully compatible with a wide variety of older encodings. There are many characters, like 囍, that don't qualify to have a code point, but that have one anyway because they're present in an encoding that Unicode commits to represent.)