Yes, all the same apart from the colour.
I prefer the 1S to the 120A v2.1 as it has a higher power RX supply (useful with todays greedy servos and to give solid voltage to PTs). The only thing they won't do is run more than 2s LiPo but for racing applications that doesn't matter a bit!
As for the size don't worry about it ... I run the HobbyWing ESC next to the servo on my FS2 and there is still room next to them for my Spektrum RX!!!
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