在 Search Ads 360 和 Google Analytics 4 之间，以下哪些指标有所不同但仍然是互补的？

Conversions (转化次数) can differ between Search Ads 360 (SA360) and Google Analytics 4 (GA4) because SA360 attributes conversions based on its own click-based attribution models (e.g., last click on a search ad), while GA4 uses its data-driven attribution model by default, considering multiple touchpoints across different channels. Despite these differences, they are complementary: SA360 shows the direct impact of search ads, and GA4 provides a holistic view of user journeys and conversion paths across all channels. Return on Ad Spend (ROAS) and Return on Investment (ROI) are calculated metrics that rely on conversion and cost data, so their underlying conversion numbers would be the primary difference. Engagements (深度互动次数) are primarily a GA4 metric and are not directly comparable as a conversion type in SA360 in the same way.