Question about MACS2 genome size (other organism)

Hi,

I’m using MACS3 to call peak with chip-seq data from Chinese hamster ovary(CHO) cells.

When running the command callpeak,

macs3 callpeak -t sample.bam -c Input.bam -n output -f BAM --outdir ../5.BEDfile/ -g hs -B -q 0.01

what should I type at the -g option? hs stands for homo sapiens.
The precompiled genome size in macs are
hs: 2.7e9
mm: 1.87e9
ce: 9e7
dm: 1.2e8

Is there no problem with using one of them with CHO cell data?

Thank you,