Share data between two builds of the same build configuration

There is a task to measure performance. This task collects data for the current build and compares it with the previous one. It must fail if some performance drops would be detected.
For this purpose a build configuration was created whose the first build step collect data and exposes them as an artifact. Another step has to compare results of the current build with the previous one. In order to compare data with the previous build a dependency on itself was introduced into the build configuration. This construction works well if an initial build, providing initial data, exists.
But it is impossible to get initial build if this dependency is enabled.
Is there any way to check if a dependency is invalid then skip some steps.