Crank arm weights

[RC856]

Hi folks.

Can anyone tell me if there's much of a weight difference between Campag SR carbon crank arms compared to Centaur carbon arms?
Just the arms...no chainrings.

I use the Centaur chainset at the moment and had planned on getting some Fiber Lyte chainrings for it.
I can get a second hand SR chainset and thought I could put the Fiber Lyte rings on those instead.
Both are 50/34. The SR is 11sp but I guessed it wouldn't matter on arms alone?

Didn't know if weight savings came from the arms or chainrings.

Thanks

[BRM]

My SR has a hollow titanium axle . . . .

[RC856]

My SR has a hollow titanium axle . . . .

So a bit lighter at least.
Do you know if the weight difference comes from this and are the rings generally the same?

[bm0p700f]

There is around 100g difference in chainset weight +BB between SR and centaur.

[kargs5k]

doesn't "lightning" brand/manufacturer make some of the lightest cranks (not including the small sub-shops that customize lighter wgts)????