Place it to the data.lua:

data.raw["unit-spawner"]["spitter-spawner"].result_units = data.raw["unit-spawner"]["biter-spawner"].result_units


I can't believe it was so simple!

You are welcome!

I've just installed the mod https://forums.factorio.com/viewtopic.php?t=45107
Open log file ...

Place it to the data.lua:

data.raw["unit-spawner"]["spitter-spawner"].result_units = data.raw["unit-spawner"]["biter-spawner"].result_units


Are you kidding me? that was it? I can't believe it was so simple!
Anyway, thank you so much! if it wasn't for you I'd still be sitting around ...

Disclaimer: I am sorry if I am posting this in the wrong forum as I spent about half an hour trying to figure it out and remain only vaguely confident this is the correct place. if this is posted in the wrong place I'd request a mod/admin please move it to the correct place thank you.

Anyway ...