Are all antennas on the ASUS RT-AX88U Pro the same, freely interchangeable?

[libork]

I bought three pieces of ASUS RT-AX88U Pro router. I unpacked all antennas from the package at once. Now I see that each antenna has a numerical marking on the bottom inside, e.g.: D2, D5, D6. Are all antennas the same, freely interchangeable between these individual routers?

 

[bbunge]

I bought three pieces of ASUS RT-AX88U Pro router. I unpacked all antennas from the package at once. Now I see that each antenna has a numerical marking on the bottom inside, e.g.: D2, D5, D6. Are all antennas the same, freely interchangeable between these individual routers?

Those are likely injection mold cavity markings. No difference in the antenna.
If there were differences the install instructions would tell you.

 

[TheLostSwede]

Considering that all antennas are dual-band 2.4 and 5 GHz antennas, there shouldn't be any difference.
Very few routers have different antennas these days, although it wasn't entirely uncommon when the first 5 GHz band products started to appear, but that was a long time ago.