Hi, we're in need of visas for two different West African countries. We have 2 valid passports. Since time is limited, to speed up processing times, we're thinking of sending one passport to one country's embassy and the second passport to the other country's embassy.

Of course, any entry and exit into one country will be on one passport -- the same passport as the one for which the visa was granted.

Is there anything that could go wrong at land borders if you depart country X on passport 1 and enter country Y on passport 2?