I just double checked to be sure - The NVR also has Axis as a private protocol. Axis has been very consistant through the years about maintaining their protocol/internal paths so Axis protocols usually always work from model to model. That is very encouraging to see the Axis protocol installed - it means your cameras 'should' work with full compatibility. If, for some reason, they don't work, then you always have Onvif compatibility to fall back on. With Onvif, there may be some limitations in settings - meaning things like Motion Detection - you'll have to set up on the camera rather than through the NVR settings dialog. This does not affect operation in a negative way - it's just a couple of different steps in the initial setup. I would say you will probably have no issues running those cameras with the NVR. If you have not already purchased the cameras - you might want to check the selection on the Security Camera King website. You may find a comparable or even better camera for the price. (Axis is a big name, so you end up paying extra for that)
That's my 2 cents!