?? What, Sir, is the difference between cow meat and beef?
Mans is used for meat, in general; gentlemen in 1965 who went shopping for gosht were immediately under a cloud of suspicion.
Now you are forcing me into pedantry.
For a long time, orthodox people in Bengal avoided chicken meat, because it was 'strange'; mutton was acceptable (to Hindus), and beef (to Muslims and to Christians), and even pork (to Christians only). Chicken was strange, and took time to get into the cuisine. Now everybody eats it.
Today, mans is meat in general; chicken is considered 'white' meat, mutton, beef and pork are 'red' meat. Doctors may permit chicken in a heart patient's diet (and, in the west, turkey, also considered 'white' meat), but emphatically not beef, pork or mutton; all these are banned for me, and I hate chicken, so that's that.