Other than the original photos being taken from different viewpoints (or using different lenses), there are four differences between these two cards:
The lower one, obviously, is the earlier. I think it may have been taken pre-WWII. The upper one, probably late 40s.
The differences I see: First, the plate numbers are different (I can only date Asheville Post Card Company cards by inference. I found another card in the E-7417 range that had a 1948 post mark). Second, the shrubbery. Third, the sign on the corner in front of the church. Fourth, the early one is titled merely “JC-71 Methodist Church, Johnson City, Tenn.” and the later one is “JC-75 First Methodist Church, Johnson City, Tenn.”