Ampure XP vs Sera-Mag Carboxylate-Modified Speedbeads

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Does anyone know the difference between these two types of beads is besides the binding buffer? What are the % solids and bead concentration differences between them? What is the DNA binding capacity difference between them? I'm presuming they're both 1um.

I have to make a different solution for extracting low molecular weight material and thus have to make a higher concentration PEG buffer. I'm trying to figure out whether I can do that with SeraMag beads instead of having to wash and reconstitute the Ampure XP beads.

Thanks, in advance.