Dell R440 Risers / NVME / Single CPU

I am trying to understand what riser options are available for the R440 with a single CPU, and supported NVMEs

Current my R440 has a single riser Part : 0FJ4M3 

With a single CPU can i swap this riser for the following 2 parts

0RHWXM   +    0MC2DD with a single CPU Configuration?

Secondly, supported NVMEs.

Reading the dell forums it seems like PM1725a are supported on R440s, so is there anything stopping me running 2 of these?

Thanks in advance