The simplest way to provide this information is by providing buyer an access to SUS. SUS actually keeps track of a different snap shot of the PO and PO confirmation, and user can see this information through Display History button in SUS PO. You can create a role for buyer by copying SUS purchaser administration role, and modify the role so it only provides a read only access. Please keep in mind that when logging in to SUS with this role, the buyer will need to select the supplier first before it can search for specific PO through Find button / link.
Now if you want to display this information in ECC, you will definitely need some development to report data based on SUS. Please keep in mind that SUS does not keep change logs like how it is done in ECC PO. Instead, it makes a copy of the document every time there are some changes to it (i.e., create a new version of the doc). If you want to proceed in this direction, you can use transaction BBP_PD to understand how the different docs are linked in SUS. From the selection screen, update object type to BUS2230, and enter SUS document number (not ECC PO number) in object id. From this transaction, you can find the relationship from a particular PO to other documents linked to it (including PO response). If you click on the row corresponding to a PO response (BUS2232), the system will take you to this document, where you can find different version of this document. I would highly discourage this option if you can go with the option highlighted in first paragraph.
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