You should be able to. The 16 refers to the rim size, so any reasonably close 16" tire should fit. The 6.00/7.50 refers to the distance from the tire bead, down across the tread, and back up to the other bead. Of course the 7.50 being the larger number, that tire will be bigger.
There are charts indicating which width rims should be used with with each tire size.