What do you mean? The number of reframes are different, the format profile is different, the # of pixels per frame are different, the Bits/Pixel*Frame are different, and the stream size is different. Something is different about the encoding / compression, even though they are both the AVC version.
Version 1:
Format profile : High@L4.1
Format settings, ReFrames : 5 frames
Bit rate : 13.5 Mb/s
Bits/(Pixel*Frame) : 0.611
Stream size : 12.6 GiB (75%)
Version 2:
Format profile : High@L4
Format settings, ReFrames : 3 frames
Bit rate : 6 341 kb/s
Bits/(Pixel*Frame) : 0.287
Stream size : 5.84 GiB (87%)
DOES NOT COMPUTE.