The look is the same, the feel definately not. If you leftclick on "slow" in the bottom right corner you have slomotion, if you rightclick it you have fastforward. Try dropping a dillo on an anchored plate. In ar1 it will drop dead and in ar2 it will bounce depending on where you hit the plate.
In editor there are several (well hidden) features like changing price, gravity and number of dillo's. In the readme file this is explained.
I am sure that in future versions the look will change
ps you can play ar1 levels in ar2 but don't expect your old solutions to work. The dillo reacts different and it's much harder to create dark force.