Male BBL - differences between male and female patients?

There are important differences between male buttock and female buttock aesthetics. The most obvious one is that males don't want to look any wider on the anterior posterior view. They just want to have more rounded projection. Your individual preferences may differ, and you may want to discuss your surgery with a surgeon who is experienced in male buttock aesthetics.

It doesn’t have to look feminine, no. More square and muscular shaped buttocks is achievable with a Brazilian Butt Lift.

Having done so many of each, this is more dependent upon the individual goals.  You are right that the goal to be achieved is usually different, and you may not need fat from the abdomen, flanks, and back transferred to the hips. Muscularity is actually an advantage, as the greater the muscularity of the glutes the more highly vascularized tissue there is around the fat grafts.  As long as you maintain the same amount of body fat after the surgery, the buttock will remain improved long term.   Kenneth Hughes, MD, Board Certified Plastic SurgeonLos Angeles, CA

Fat transference to buttocks is not uncommon but guys do not talk much about it. Definitely there are differences amongst female to male buttocks procedures and goals are completely different. For instance removing fat from lovehandles is mandatory and some  lipo to abdomen would be both perfect areas to harvest fat to add to buttocks. Then we have to create a masculine butt no hips, and by the contrary create a nice lateral-muscular dent like the muscle indentation if you agree of course. And just want to encourage you because as woman we do like man with a litte something. Dr. Cardenas 

Male and female body structures are different this is why for females wider hips are preferred and for males a straighter look is ideal. When having a BBL it is important to have this in mind while molding the waist / hip / gluteal area to prevent a male to en up looking like a female. Regarding enhancing the buttocks, many men do it, but again no need to enhance hips in men, and of course as you say it no exaggerations to keep a male look.