What is a alternate class for what

[The World Shaper]

looked for hours and hours and i apparently can't find anywhere to confirm any of this information.

gunslinger = fighter
Cavalier= samurai
Ninja= rogue

are these the only alternate classes for x class are alchemist, magus witch a alternate for anyone?

[CupcakeNautilus]

Paladin - Antipaladin
Cavalier - Samurai
Rogue - Ninja

Those 3 are the only alternate classes. Gunslinger is not one.

[The World Shaper]

Ah alright thanks cause i saw people saying gunslinger was a fighter alt and i got all confused

[N. Jolly]

The World Shaper wrote:

Ah alright thanks cause i saw people saying gunslinger was a fighter alt and i got all confused

It was originally planned as one, but was upgraded to its own full class, which is kind of a mixed bag on how much it was needed. I think ninja should have been the upgraded class, but QSS.

[My Self]

Gunslinger is not a Fighter, although they both are full BAB, have proficiency with all martial weapons, have strong Fort saves, and have bonus feats. Gunslinger had a child with Fighter. That child is called the Swashbuckler (a hybrid class).

As for alternate classes, what Cupcake said is correct.