This is a known issue. The algorithm used for the fog glow effect is different between the real time compositor and the standard compositor. And in Blender 4.2 I believe the implementation used by the GPU is going to be renamed to “Bloom” to represent the fact it’s different from fog glow.
Either way, feedback about the realtime compositor should be made on the realtime compositor feedback thread, not the the EEVEE-Next thread: Real-time Compositor: Feedback and discussion