Yes of course!!
10 kva electrical power is 10 kva electrical power either it
would be three phase or single phase. But other factors i.e.
current, voltage changes accordingly.
Actually this question is quit confusable. Because in 3phase
system, if each phase gives 10kva power (single phase power = 10
kva) then 3 phase power will be 10 X 3 = 30 Kva
If we go leteratualy towasrds the question, then the asnwer will
be - No. becasue 10 kva supply to 3 phase load will be 3phase
supply(i.e440V) & 10kva supply to single phase load will be
single supply (i.e 250V).