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Some beekeepers treat their hive equipment with a soaking in a beeswax & rosin mixture or a paraffin & rosin mixture at 250F. They have no problem with the mixture separating between heats.
Many substances have overlapping temperature ranges where they are liquid at the same temperature and can be mixed. Not all are like oil & vinegar, but they also do not combine chemically to make a new substance.
The different grades of beeswax would simply be new cappings (pale yellow)wax or old brood box (dark brown) wax and wether it was completely clean or still had some debris left in it.