No.
As of A18,
Certain zombies will spawn in certain biomes.
A few further (soldier zeds) will also spawn near barracks/soldier places.
Bikers in bars.
IF the zombie is biome locked, GameStage will eventually unlock and send at you.
The spaces are generally in sets of 7-9gamescore
But this is a little awk cuz sleeper volumes can still spawn more rediculous zeds than regular.
Gamestage means nothing as far as zed spawning unless its a cop, demolisher or boss, feral, radiated or legendary.
the TDLR is roughly;
Green Biome=Super basic zeds.
Desert Biome=Cowboys,Dogs, Bikers
Wasteland Biome=Any any time-Even has a 25% chance at all times for feral zeds.
(With the cop, demo, boss, feral, radiated, legendary exceptions)
*All previous zeds can spawn in higher level biomes.*
Source:1700 hours in-game; Code reading.