Hi Daniel,
The SCM 7.0 version will have the base Netweaver version of 7.0. Similarly EHP3 of SCM 7.0 will have the netweaver version of 7.4.
As SAP introduced SAP Netweaver base components and all the Business suite will sit on top of the netweaver components. Please find the below links for more information.
Confused with different SAP Business Suite Releases ?? Read it !!
Regards,
Raja. G