The studies themselves work the same. What changed is the tracking you need before you launch one:
Offline conversions: GCLID-only imports are not enough. Use enhanced conversions for leads with hashed first-party data.
GA4-imported web conversions are explicitly not supported.
Enhanced conversions need more detail on hashed emails, phone numbers, addresses and transaction IDs.
Consent Mode: more guidance on Advanced Consent Mode for the EEA, UK and DMA.
App conversions: more requirements for Android, iOS, Firebase and third-party attribution.
Data quality: 7 to 14 days of continuous conversion data first, dynamic values with valid currencies, and about 75 to 80% of web conversion traffic through Google tag gateway.
My tip: if you rely on CRM data, GA4 imports or app conversions, audit your tracking before you start a study.
Via Barry Schwartz.
