I don't have an RM2 so I can't say for sure, there might be some differences w/ button compatibility or calibration, but from what I've seen online and w/ various reviews, most of the different pens should all be interchangeable if they are using Wacom EMR.
> The new Marker and Marker Plus have been designed specifically to work in conjunction with reMarkable 2’s second-generation CANVAS display. We can therefore not guarantee an optimal experience if used with the reMarkable 1.
EDIT not incompatible: https://support.remarkable.com/s/article/Markers-and-Marker-...