Not even remotely similar. Cell Games' SS is just SS but it's not ki draining because they are used to the form, nothing else. CSSB is based on the explosive power that SSGSS has (exclusively) during the first seconds after transforming, mantaining this power for the whole battle, and it's not even confirmed if the form is still ki draining (and stamina draining) or not, we only know about the explosive power being permanent.
Mastered SS = SS but no ki drainage
Completed SSB = SSB but the initial burst of power is permanent
basically impossible for CSSB to be similar to other forms because only Blue has the explosive power>b-but the point of both is not losing power!
I guess all fucking forms are the same because the point of transforming is get a multiplier for your power level then