Iv got 08 switch size 12 and 01 switch size 9 I could tell difference was no good bar smaller on the size 9 didn't like it at all. I have not checked line lengths though between both bars.
Sure you can use the 08 bar on the 2010 SB. Just remember it is a different bridle system and you will have to use the safety leash on it from the 08 model ie flagging on one of the back lines.
i asked cabrinha a similar Q and they said dont do it but i'm flying a 12m SB3 (08) on a 10m SB4 bar. also tried it on a 9m nomad setup. lines and bar both shorter and more responsive. however doesn't flag to a single line and so doesn't quite have same absolute depower.
