Not incompatible, IMHO, but different. Christian contemplation (=meditation in buddhism) has an intent. A striving. Buddhist meditation does not. (Some would argue with this saying you cannot be meditating at all unless you have some striving.)
However, the basic preparations are quite similar. Purity (basically identical), discipline (the same), concentration (very helpful in both.) Compassion at the center of reality (very similar in both).
But, there is the emphasis on intent in Christian contemplation. And also in Christian contemplation, hopefully, there is the constant realization that while your presence is required, God's reaction is His alone.
In buddhism this is lacking, the existence or non-existence of a diety is left open (at least in many branches).
I gather that the Christian monk is neither a gnostic nor an agnostic. The Buddhist monk seems to be one or the other, or both.