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You would have to look at the detailed specification to see if the video formats are compatible.
They may well be! There are not that many different formats in use.
But seeing both of them at the same time and on a single monitor would tend to be like trying to watch two TV channels at the same time on a single TV.But special electronics allowing this combined viewing may be available.
For example： NYXCAM 1080P cameras compatible with the DVR as shown in the picture: