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@Howard
The new spindle is 109mm simply to clear PF30 bb cups and support bb30a. The axle / arm interface hasn't changed.
With the correct spacers Sl arms should work fine on the new axle and sisl2 arms should work on the old axle.
The spider spline interface hasn't changed but CSG can confirm if you'd like to back up information on the Internet given by a stranger :)