Access to level Abilities for Mutagens for Multi-class

[Waymo]

I have been looking to see if levels stack for accessing level specific abilities for mutagens. There are so many threads to go through and I haven't had a lot of luck finding the specific answer.

Basically does a Beastmorph (Alchemist Archetype) stack with a Mutagenic Mauler (Brawler archetype)?

A level 3 Beastmorph and a level 3 Mutagenic Mauler's mutagen stacks to level 6, meaning 60 minutes of use time but do the levels stack for access to each classes level 6 Mutagen abilities.

A Beastmorph gains two of the abilities listed in the Beast Shape I spell.

While a Mutagenic Mauler gains a low-light vision and +10ft move at level 4, as well as a +2 bonus on damage at level 6.

[Nefreet]

If there's nothing written in either ability saying that their levels stack, then they do not.

[Waymo]

It says "This functions as an alchemist level for this ability (alchemist levels stack with bralwer levels for determining the effect of this ability)."

Thanks for the reply Nefreet.

I'm still not sure if that means that it does for the special abilities/bonuses or just for the mutagen time length.

Does that help to clear things up more?