Shimano M950 M951 Crank Arms

[Matttymm]

Does anyone know whether the drive side and non drive side crank arms are actually different ?

I know that M950 has a different profile from M951 but are each side different or are they the same.

Not sure whether the drive side is different or whether the spider attachment is the same regardless

Hoping to not have to separate my chainset to find out.

Thanks.