VOR transmitters are aligned using 'station declination' to a magnetic north value which existed on a certain date. But they are not updated with change of local magnetic variation until the difference between variation and declination becomes significant - at which time the 'man with the screwdriver' adjusts them and the new orientation is publicised.
Given the overall system accuracy of a typical GA avionic fit and the relatively short distance from the station used for navigation, it's highly unlikely that the difference is significant.
Try flying in a straight line between 2 VORs and watching the GPS CDI if you have one....