The hiragana and katakana and various versions thereof for each mora all share the same "primary" Unicode collation value. Adding a dakuten or handakuten create

The hiragana and katakana and various versions thereof for each mora all share the same "primary" Unicode collation value. Adding a dakuten or handakuten creates a secondary difference: e.g. は (ha) < ば (ba) < ぱ (pa). As between the versions for the same mora, they get sorted with tertiary differences as: hiragana comes before katakana, small comes before regular-size, and for katakana regular width comes before halfwidth. There's also a "circled" set of the katakana that sort after the halfwidth ones. So they're equivalent (or not) depending on how you're doing the collation/comparison.