Just a bit bigger, but not really noticeable as far as carrying goes
Jumping to 9mm, IMO, makes the jump from pocket carry to IWB carry.
Some people can fit a P938/CM9/PF9/Shield9 in their pocket with success, but I'm not one of those cargo shorts wearers. It also weighs a good bit more than a 380.
So, in response to your statement, it may be only slightly noticeable at the range, but it will be noticeable when carrying because your method will have to change.