Could be, or not. Difficult to say. The MK7AC ones are designed for 5 GHz for sure, but there's no guarantee the 2.4 GHz ones are even if it would be possible.
I don't have the MK7AC myself, I use another 5 GHz adapter with the Mark VII, so I don't know in which way the antennas might differ physically. If there aren't any distinct ways to tell which one is for the Mark VII or the MK7AC, then perhaps discretely "tag" some of them, or put some colored tape (or such) on them. The antennas on the 5 GHz adapter I use are very easy to identify because of shape/design.