Hi!
Yes it's possible, it's enough initializing both at same time, one after another.
you need just to do this:
SetAdMobDetails ( advkey_android_admob_inter ) // Intersticial admob
SetAdMobDetails ( advkey_android_admob_banner ) // Banner admob
SetChartboostDetails (advkey_android_chartboost_appid_inter, advkey_android_chartboost_signature_inter)
This is an example of how to display a full screen admob intersticial
if GetFullscreenAdvertLoadedAdMob() = 1
PauseMusic()
ShowFullscreenAdvertadmob()
SetAdvertVisible ( 1 )
RequestAdvertRefresh()
ResumeMusic()
endif
and this one, an Admob banner
function LIBdisplayAdvertBanner()
CreateAdvert(0, 1, 2, 1) // Test
SetAdvertVisible ( 1 )
RequestAdvertRefresh()
endfunction
Don't forget to initialize first the key chains before call any other functions..
You can find a lot more examples around

hope to be helpful.