In general yes ... since the 1/8 buggy motor usually draw less power then SCT. 1/8 buggy is app. 3.5kg, 1/10 SCT is app. 2.5kg-3kg.
Again, many people run3s, 4s, even 6s in SCT (USA style) my Turnigy SCT, (lets just talk about 4wd) I run a 2000kv motor, with a light small 3000mah 3s lipo, I got probably 40-50min run time .. (not very fast) and for my Losi, when I run it with 5200 tenshock, even a 5000mah lipo can last only ~10 min ... once I switch to 4500kv, then back to ~ 15min or so .. Same as 1/8 ..
Again, majority 1/8 is running single Pack, but I guess it is more easy and cheaper plus much more selection to buy 2s lipo in HK ... 4s, 5s, or 6s are not that popular, also, popular buggies in HK, Team C and Serpent 811, both run dual pack.
Popular 1/8 ebuggy, Losi, Associated, Mugen, Kyosho, Tekno, HPI, Xray, Hong Nor, Hobao etc, are running single pack lipo.
I like single pack, it is more convenience, much much shorter charging time and storage time .. and less chance to pair up "wrong" batteries .. I actually run 6s most the time (I dont race), match with low kv motor, ~ 1400kv - 1550kv, so a 3300mah 6s pack runs as long as 5000mah 4s.