If you really want to lose weight below 40 kg, it will take a few months, so as long as there is no deformity, the time difference is 1 year, but the height of the muscle gain is 180, and the upper and lower shoulder widths are over 52. It is still possible to increase it to this weight in 3-4 years (about 86kg after degreasing) and carve the details for 5-6 years. If you only have 17 or shoulder width less than 50, but head circumference more than 60, you can only say.
In addition, the shape of biceps, the number and position of abdominal muscles are all natural, and the square chest is not round (and vice versa). You can only make limited improvement through practice, but if your abdominal muscles are naturally left 4 and right 3, then the eighth abdominal muscle is obviously not available (and of course asymmetrical).