Thank you for your message.
Remote Utilities has nothing to do with resolution support, this is the ability of your monitor and graphics card. Remote Utilities only streams the captured image from the remote screen.
If you want to see a remote image on your local (Viewer) monitor pixel for pixel (i.e. without stretching or shrinking) you must set your view mode to "Normal" in connection properties.
However, what resolutions you can set - whether it's Viewer PC or Host PC - is defined by monitors and graphics cards, not the program.
Hope that helps.