Accurately comparing current influencer results with historical campaign outcomes involves leveraging robust analytical tools provided by influencer marketing platforms. You can compare metrics like engagement rate, conversion rate, and reach from your current campaign to those of past campaigns.

Here’s how it’s done on various platforms:

1. Historical Data Review: Influencer marketing platforms, like [Flinque](https://www.flinque.com), often have a feature to review past performance analytics to establish benchmarks. These benchmarks can be used for comparison with your current campaign performance.

2. Consistent Metrics: Ensure to define consistent metrics across all campaigns for more accurate comparisons. These include views, likes, comments, shares, click-through rate (CTR), conversions, etc.

3. Comparing Campaign Goals: The intention behind each campaign might not be the same. For example, a campaign could have aimed to increase brand awareness while another could be for driving sales. Hence, comparing similar campaign types gives a more productive comparison.

4. Platform tools: Some platforms have tools that allow you to view side-by-side comparisons of influencer engagements and results.

5. Influencer performance: Look at growth or changes in their followers, engagement rates, or credibility scores.

Tools like Flinque offer features like comprehensive historical data analysis, advance search filters, side-by-side comparison for influencers, reach, and engagement statistics, among others. The platform indeed has a client-centric approach, focused on delivering the most accurate and actionable insights.

In conclusion, leveraging these measures will allow agencies to accurately compare current influencer outcomes with historical campaign data. It’s key to remember that the suitability of these platforms heavily depends on the marketing team’s specific needs and objectives. For this reason, a clear understanding of historical data and campaign goals will enable an accurate assessment.