As with "negro" and "colored", the new positive term eventually became a slur via concerted efforts from its opponents. ("DEI mayor": https://www.npr.org/2024/04/04/1242294070/baltimore-key-brid...)
Affirmative Action was from Executive Order 11246 (1965) -- concurrent with and part of the same movement as civil rights legislation -- applying to federal contracting; it largely spread to large organizations that weren't direct federal contractors through subcontracting relationships and through state governments adopting similar requirements in their contracting.
They're absolutely in the same category.
A lot of the culture war entities which now dominate the GOP did so (obviously, with different language, as "woke" and "DEI" weren't the current generic epithets for things the Right doesn't like) at the time, but (1) were mollified in some cases with special exclusions, like religious schools being excluded from the definition of covered public accommodations, and (2) otherwise were less politically powerful within the party.
But related.
I was at a museum that had a full-sized submarine on display. There was a touchable model and audio description for blind people.
Equal, as much as possible - a Braille variant of a novel, for example, provides a fairly equal experience. Equitable, when perfect equal results are not possible. You can't fix a person's severed optic nerve, but you can certainly attempt to give them fair access to things.