M/M/1/K Queue vs M/D/1/K Queue

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I simulate both M/M/1/K and M/D/1/K, with same arrival rate and same queue size K. I get the result that rejection probability of M/D/1/K is lower than M/M/1/K, but I could not quite see why constant service time lowers the rejection probability. May someone gives me the intuition behind this? Also, in general, what influence does constant service time or arrival time have in the queue?