Yes, scores from benchmarks with the same name can be compared across platforms. For example, you can compare a Sling Shot score from an Android device with a Sling Shot score from an Apple device. We provide a ranked list of the best smartphones on our website.
Scores from tests with different names are not comparable. For instance, Sling Shot scores should not be compared with scores from Sling Shot Extreme. Even though the tests appear to be similar, they use different rendering resolutions and post-processing techniques.
When comparing scores across platforms, please remember that the results reflect the performance of both hardware and software. APIs with low overhead, such as Metal and Vulkan, can deliver more performance than OpenGL ES even on devices with similar hardware.