Thanks, Natalie & Rae
Features-wise, there are pretty much no differences. The Runner 2 only got a fabric / colorway makeover, so it looks a bit better, AND they tested and claimed a 25kg weight capacity. I don't think they changed something on the frame though, they just paid for the testing - so it should be ok with the 1st generation, too. So pretty much only a design update + an officially higher maximum weight in the seat.