Does anyone know what parts if any are typically compatible between the R620 and R630? For example, on my R620s, I have a bunch of newer drives and 256gb RAM each and on a couple I have 2690v2 procs. I also have QLE2562 in each. I figure those are transferable but not sure about the drives/RAM/CPU.

I'm considering upgrading but don't know if I have to re-purchase everything or if some is salvageable.