Right now google allows the SPF domain, and/or the DKIM signing domain to be different than the From domain, not just a subdomain but an entire different domain

Right now google allows the SPF domain, and/or the DKIM signing domain to be different than the From domain, not just a subdomain but an entire different domain. From an ESP perspective, will this drop shared SPF(Return-Path) domains? I'm assuming DKIM has to match, just not sure about the return-path side. It's a bit vague in the support article.