Not sure if you can check which pool a replica belongs to but you can check pooled VM's to see what replica they are attached to by looking at their vmdk.
You should see something like this:
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Disk DescriptorFile
version=1
encoding="UTF-8"
CID=0b3be2f2
parentCID=0b3be2f2
createType="vmfsSparse"
parentFileNameHint="/vmfs/volumes/4ae14093-5101877e-5ff9-001cc0eaeeb9/replica-5a57667a-6a66-401f-bcb7-/replica-5a57667a-6a66-401f-bcb7-.vmdk"
Extent description
RW 16777216 VMFSSPARSE "nplink-2-delta.vmdk"
The Disk Data Base
#DDB
ddb.longContentID = "a920236ed127a74ab7138bd00b3be2f2"
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Not sure how many VM's you have but you could do a process of elimination ...