Well, male breasts are quite different from female breasts; even if the person (a man in this case) is a bit heavy set, the breasts tend not to be proportional to his body; so in my opinion, there is a significant difference in size, shape, texture, fullness, firmness, and glandular tissue.
There is, however, a condition called
gynecomastia which firm breast tissue forms in males. This condition is usually caused by changes in hormones at puberty or as part of aging but sometimes results from an altered estrogen-androgen balance, in favor of estrogen, or increased breast sensitivity to a normal circulating estrogen level. The only way gynecomastia can be treated is by surgery or liposuction in some cases; Please take a sec to read the above article in our wiki for further information.
tinkerbell