General practice, not a claim about any one account.
DifferenceConsent choices and blocked scripts
Visitors who decline analytics cookies are not fully measured. Blocked scripts and slow pages can also drop some visits. Sessions and purchases can then look lower than the store, for reasons unrelated to the ads. When consent is limited, read the numbers as a measured sample, not a full count.
DifferenceChannel rules and credit
Analytics assigns credit to channels by its own rules, and each ad platform assigns credit by its own rules. The same purchase can appear under paid social in one tool and under direct or organic in the other. Use the same rules when you compare, or label the difference.
DifferenceSampling, thresholds and fresh data
Some reports on large data use sampling, and some hide small groups for privacy. Recent days can still change after the first load. Totals may not add up across rows. Compare closed periods and totals, not single lines.