Here's what the japanese ACR wiki has on his dash
http://wiki.livedoor.jp/ggxx_matome/d/ACR%a1%a1%a5%b8%a5%e7%a5%cb%a1%bc%a1%a1%b4%f0%cb%dc%a5%c7%a1%bc%a5%bf
The numbers line up with their AC wiki, and it has some mention of the mook.
Here's their AC wiki
http://wiki.livedoor.jp/ggxx_matome/d/%a5%a2%a5%af%a5%bb%a5%f3%a5%c8%a5%b3%a5%a2%a1%a1%a5%b8%a5%e7%a5%cb%a1%bc%a1%a1%b4%f0%cb%dc%a5%c7%a1%bc%a5%bf
All I've noticed is like what frcflying said, further dash.
I tried testing for any faster recovery of sorts. Training mode's playback memory is retained while switching between AC and ACR.
The test I did was, in ACR: CH 5H>Lv1MC, Dash, f.S on standing Potemkin. This is all 1f timing. When you switch over to AC and try to playback the memory, it should fail, due to the slower MC.
In AC, set dummy to crouch, to compenstate for the 1f slower MC. It should work like in ACR, all 1f timing.
Back to ACR, keep dummy set to crouch. Now do CH 5H>Lv1MC, Dash, 2S.
2S is just 1f slower than f.S; and this is feeling pretty 1f linky. So I'm just going to stop here and call it done. The changes notes must of been a wonky translation? Next question is: Does a dash jump cover more ground?