I think that the sharing of export settings will only be possible if the settings are held external to the user.config essentially the same as the editing presets. While these can be imported and exported from within the preset editor the simplest way to manage them is to simply copy all of them and to cull the ones you don’t want, change the names etc. using standard file manager software.
The good news is that we can currently do that with presets but not with export settings. Care must be taken if using the file management technique with respect to compatibility between PL releases if the 2 systems are running different levels of software but that should not be a problem if the two systems are running the same level of software.
What could be a problem is moving photos and DOPs between system please see How to use PhotoLab on multiple Apple Computers - #32 by mikemyers for a discussion of the problems of transferring DOPs in particular between systems
